workflows/e2e: Use local envtest github action

Use local actions/envtest to setup envtest.

The envtest action downloads the envtest binaries for a given version
inside a container and moves them to the host. The binaries also
include the setup-envtest binary. The env var KUBEBUILDER_ASSETS is
also set to the directory containing the envtest binaries.

The cache in /github/home/.cache populated when installing setup-envtest
causes the builds to fail in `make test` target due to the cached go
build files, maybe due to some incompatibilities. Deleting them at the
end of the action helps avoid affecting other build steps in the
workflow.

Since the run-test action runs in a container, the host $PATH is not
passed to the test container. The ENV directive in Dockerfile is used to
append the PATH with envtest binary path. This helps avoid redownload of
the envtest binaries when it's not found in the path via the Makefile
targets.

Signed-off-by: Sunny <darkowlzz@protonmail.com>

.github/actions/envtest/Dockerfile

@@ -0,0 +1,6 @@
+FROM golang:1.16-buster
+
+COPY entrypoint.sh /entrypoint.sh
+RUN chmod +x /entrypoint.sh
+
+ENTRYPOINT ["/entrypoint.sh"]

.github/actions/envtest/action.yaml

@@ -0,0 +1,16 @@
+name: Setup envtest
+description: A GitHub Action for setting up controller-runtime envtest
+author: Flux authors
+branding:
+  color: blue
+  icon: command
+inputs:
+  version:
+    description: 'Kubernetes version'
+    required: false
+    default: "latest"
+runs:
+  using: docker
+  image: Dockerfile
+  args:
+    - ${{ inputs.version }}

.github/actions/envtest/entrypoint.sh

@@ -0,0 +1,25 @@
+#!/bin/bash
+
+set -eu
+
+# envtest kubernetes version.
+VERSION=${1:-latest}
+
+go install sigs.k8s.io/controller-runtime/tools/setup-envtest@latest
+setup-envtest use $VERSION
+
+ENVTEST_DIR=$(setup-envtest use -i $VERSION -p path)
+SETUP_ENVTEST_PATH=$(which setup-envtest)
+
+mkdir -p $GITHUB_WORKSPACE/envtest
+mv $ENVTEST_DIR/* $GITHUB_WORKSPACE/envtest
+mv $SETUP_ENVTEST_PATH $GITHUB_WORKSPACE/envtest
+ls -lh $GITHUB_WORKSPACE/envtest
+
+echo "$GITHUB_WORKSPACE/envtest" >> $GITHUB_PATH
+echo "$RUNNER_WORKSPACE/$(basename $GITHUB_REPOSITORY)/envtest" >> $GITHUB_PATH
+echo "KUBEBUILDER_ASSETS=$GITHUB_WORKSPACE/envtest" >> $GITHUB_ENV
+
+# Cleanup cache to avoid affecting other builds. Some go builds may get
+# affected by this cache populated in the above operations.
+rm -rf /github/home/.cache

.github/actions/run-tests/Dockerfile

@@ -17,6 +17,9 @@ RUN set -eux; \
 RUN groupadd -g 116 test && \
     useradd -u 1001 --gid test --shell /bin/sh --create-home test
 
+# Set path to envtest binaries.
+ENV PATH="/github/workspace/envtest:${PATH}"
+
 # Run as test user
 USER test
 

.github/workflows/e2e.yaml

@@ -26,15 +26,16 @@ jobs:
           image: kindest/node:v1.21.1@sha256:69860bda5563ac81e3c0057d654b5253219618a22ec3a346306239bba8cfa1a6
       - name: Setup Kustomize
         uses: fluxcd/pkg/actions/kustomize@main
-      - name: Setup Kubebuilder
-        uses: fluxcd/pkg/actions/kubebuilder@main
+      - name: Setup envtest
+        uses: ./.github/actions/envtest
+        with:
+          version: "1.19.2"
       - name: Setup Helm
         uses: fluxcd/pkg/actions/helm@main
       - name: Run tests
         uses: ./.github/actions/run-tests
         env:
           GOPATH: /github/home/go
-          KUBEBUILDER_ASSETS: ${{ github.workspace }}/kubebuilder/bin
       - name: Check if working tree is dirty
         run: |
           if [[ $(git diff --stat) != '' ]]; then
@@ -44,14 +45,10 @@ jobs:
           fi
       - name: Build container image
         run: make docker-build IMG=test/source-controller:latest
-        env:
-          KUBEBUILDER_ASSETS: ${{ github.workspace }}/kubebuilder/bin
       - name: Load test image
         run: kind load docker-image test/source-controller:latest
       - name: Deploy controller
         run: make dev-deploy IMG=test/source-controller:latest
-        env:
-          KUBEBUILDER_ASSETS: ${{ github.workspace }}/kubebuilder/bin
       - name: Run smoke tests
         run: |
           kubectl -n source-system apply -f ./config/samples