[master] Update GitHub Actions (#3972)

Copied from `https://github.com/knative/.github/tree/master/workflow-templates`.
/assign grantr matzew n3wscott
/cc grantr matzew n3wscott

.github/workflows/knative-go-build.yaml

@@ -0,0 +1,49 @@
+# Copyright 2020 The Knative Authors.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+name: Build
+
+on:
+  push:
+    branches: [ 'master', 'release-*' ]
+  pull_request:
+    branches: [ 'master', 'release-*' ]
+
+jobs:
+
+  build:
+    name: Build
+    strategy:
+      matrix:
+        go-version: [1.15.x]
+        platform: [ubuntu-latest]
+
+    runs-on: ${{ matrix.platform }}
+
+    steps:
+
+      - name: Set up Go ${{ matrix.go-version }}
+        uses: actions/setup-go@v2
+        with:
+          go-version: ${{ matrix.go-version }}
+        id: go
+
+      - name: Check out code
+        uses: actions/checkout@v2
+
+      - name: Vet
+        run: go vet ./...
+
+      - name: Build
+        run: go build -v ./...

.github/workflows/knative-go-test.yaml

@@ -0,0 +1,46 @@
+# Copyright 2020 The Knative Authors.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+name: Test
+
+on:
+  push:
+    branches: [ 'master', 'release-*' ]
+  pull_request:
+    branches: [ 'master', 'release-*' ]
+
+jobs:
+
+  test:
+    name: Test
+    strategy:
+      matrix:
+        go-version: [1.15.x]
+        platform: [ubuntu-latest]
+
+    runs-on: ${{ matrix.platform }}
+
+    steps:
+
+      - name: Set up Go ${{ matrix.go-version }}
+        uses: actions/setup-go@v2
+        with:
+          go-version: ${{ matrix.go-version }}
+        id: go
+
+      - name: Check out code
+        uses: actions/checkout@v2
+
+      - name: Test
+        run: go test -race ./...

.github/workflows/knative-stale.yaml

@@ -0,0 +1,31 @@
+name: 'Close stale'
+on:
+  schedule:
+  - cron: '* * * * *'
+
+jobs:
+  stale:
+    runs-on: 'ubuntu-latest'
+    steps:
+    - uses: 'actions/stale@v3'
+      with:
+        repo-token: '${{ secrets.GITHUB_TOKEN }}' # No need to setup
+
+        stale-issue-message: |-
+          This issue is stale because it has been open for 90 days with no
+          activity. It will automatically close after 30 more days of
+          inactivity. Reopen the issue with `/reopen`. Mark the issue as
+          fresh by adding the comment `/remove-lifecycle stale`.
+        stale-issue-label: 'lifecycle/stale'
+        exempt-issue-labels: 'lifecycle/frozen'
+
+        stale-pr-message: |-
+          This Pull Request is stale because it has been open for 90 days with
+          no activity. It will automatically close after 30 more days of
+          inactivity. Reopen with `/reopen`. Mark as fresh by adding the
+          comment `/remove-lifecycle stale`.
+        stale-pr-label: 'lifecycle/stale'
+        exempt-pr-labels: 'lifecycle/frozen'
+
+        days-before-stale: 90
+        days-before-close: 30

.github/workflows/knative-style.yaml

@@ -0,0 +1,57 @@
+# Copyright 2020 The Knative Authors.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+name: Code Style
+
+on:
+  push:
+    branches: [ 'master', 'release-*' ]
+  pull_request:
+    branches: [ 'master', 'release-*' ]
+
+jobs:
+
+  lint:
+    name: Lint
+    runs-on: ubuntu-latest
+
+    steps:
+
+      - name: Set up Go 1.15.x
+        uses: actions/setup-go@v2
+        with:
+          go-version: 1.15.x
+        id: go
+
+      - name: Check out code
+        uses: actions/checkout@v2
+
+      # TODO: add prettier step
+      # TODO: add goimports step
+
+      - name: Go Format
+        shell: bash
+        run: |
+          gofmt -s -w $(find -path './vendor' -prune -o -path './third_party' -prune -o -type f -name '*.go' -print)
+
+      - name: Verify
+        shell: bash
+        run: |
+          if [[ $(git diff-index --name-only HEAD --) ]]; then
+              echo "Found diffs in:"
+              git diff-index --name-only HEAD --
+              echo "${{ github.repository }} is out of style. Please run go fmt."
+              exit 1
+          fi
+          echo "${{ github.repository }} is formatted correctly."

.github/workflows/knative-verify.yaml

@@ -0,0 +1,74 @@
+# Copyright 2020 The Knative Authors.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+name: Verify
+
+on:
+  push:
+    branches: [ 'master', 'release-*' ]
+  pull_request:
+    branches: [ 'master', 'release-*' ]
+
+jobs:
+
+  verify:
+    name: Verify Deps and Codegen
+    strategy:
+      matrix:
+        go-version: [1.15.x]
+        platform: [ubuntu-latest]
+
+    runs-on: ${{ matrix.platform }}
+
+    env:
+      GOPATH: ${{ github.workspace }}
+
+    steps:
+
+    - name: Set up Go ${{ matrix.go-version }}
+      uses: actions/setup-go@v2
+      with:
+        go-version: ${{ matrix.go-version }}
+      id: go
+
+    - name: Install Dependencies
+      run: |
+        go get github.com/google/ko/cmd/ko
+        go get github.com/google/go-licenses
+
+    - name: Check out code onto GOPATH
+      uses: actions/checkout@v2
+      with:
+        path: ./src/knative.dev/${{ github.event.repository.name }}
+
+    - name: Update Codegen
+      shell: bash
+      run: |
+        pushd ./src/knative.dev/${{ github.event.repository.name }}
+        ./hack/update-codegen.sh
+        popd
+
+    - name: Verify
+      shell: bash
+      run: |
+        pushd ./src/knative.dev/${{ github.event.repository.name }}
+        if [[ -z "$(git status --porcelain)" ]]; then
+            echo "${{ github.repository }} up to date."
+        else
+            repoDiff=$(git diff-index --name-only HEAD --)
+            echo "Found diffs in: $repoDiff"
+            echo "${{ github.repository }} is out of date. Please run hack/update-codegen.sh"
+            exit 1
+        fi
+        popd