chore(ci): move vet to GitHub Action (#6911)

* chore(ci): move vet to GitHub Action

* vet on main

* dedupe vet.sh

Co-authored-by: gcf-merge-on-green[bot] <60162190+gcf-merge-on-green[bot]@users.noreply.github.com>

internal/kokoro/vet.sh → .github/workflows/vet.sh

@@ -19,10 +19,6 @@ set -e
 # Display commands being run
 set -x
 
-if [[ $(go version) != *"go1.19"* ]]; then
-  exit 0
-fi
-
 # Fail if a dependency was added without the necessary go.mod/go.sum change
 # being part of the commit.
 go mod tidy

.github/workflows/vet.yml

@@ -0,0 +1,23 @@
+---
+name: vet
+on:
+  pull_request:
+  push:
+    branches:
+      - main
+
+jobs:
+  vet:
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@v3
+    - uses: actions/setup-go@v3
+      with:
+        go-version: '1.19'
+    - name: Install tools
+      run: |
+        go install golang.org/x/lint/golint@latest && \
+        go install golang.org/x/tools/cmd/goimports@latest && \
+        go install honnef.co/go/tools/cmd/staticcheck@latest
+    - name: Execute vet.sh
+      run: ./.github/workflows/vet.sh

internal/kokoro/continuous.sh

@@ -74,7 +74,6 @@ try3() { eval "$*" || eval "$*" || eval "$*"; }
 
 # All packages, including +build tools, are fetched.
 try3 go mod download
-./internal/kokoro/vet.sh
 
 # runDirectoryTests runs all tests in the current directory.
 # If a PATH argument is specified, it runs `go test [PATH]`.

internal/kokoro/presubmit.sh

@@ -40,7 +40,6 @@ try3() { eval "$*" || eval "$*" || eval "$*"; }
 
 # All packages, including +build tools, are fetched.
 try3 go mod download
-./internal/kokoro/vet.sh
 
 set +e # Run all tests, don't stop after the first failure.
 exit_code=0