ci: use matrix to test containerd backed image store

Signed-off-by: CrazyMax <crazy-max@users.noreply.github.com>

.github/workflows/.test-prepare.yml

@@ -0,0 +1,35 @@
+# reusable workflow
+name: .test-prepare
+
+# TODO: hide reusable workflow from the UI. Tracked in https://github.com/community/community/discussions/12025
+
+on:
+  workflow_call:
+    outputs:
+      matrix:
+        description: Test matrix
+        value: ${{ jobs.run.outputs.matrix }}
+
+jobs:
+  run:
+    runs-on: ubuntu-20.04
+    outputs:
+      matrix: ${{ steps.set.outputs.matrix }}
+    steps:
+      -
+        name: Checkout
+        uses: actions/checkout@v3
+      -
+        name: Create matrix
+        id: set
+        uses: actions/github-script@v6
+        with:
+          script: |
+            let matrix = ['graphdriver'];
+            if ("${{ contains(github.event.pull_request.labels.*.name, 'containerd-integration') || github.event_name != 'pull_request' }}" == "true") {
+              matrix.push('snapshotter');
+            }
+            await core.group(`Set matrix`, async () => {
+              core.info(`matrix: ${JSON.stringify(matrix)}`);
+              core.setOutput('matrix', JSON.stringify(matrix));
+            });

.github/workflows/.test.yml

@@ -17,7 +17,8 @@ env:
   TESTSTAT_VERSION: v0.1.3
   ITG_CLI_MATRIX_SIZE: 6
   DOCKER_EXPERIMENTAL: 1
-  DOCKER_GRAPHDRIVER: overlay2
+  DOCKER_GRAPHDRIVER: ${{ inputs.storage == 'snapshotter' && 'overlayfs' || 'overlay2' }}
+  TEST_INTEGRATION_USE_SNAPSHOTTER: ${{ inputs.storage == 'snapshotter' && '1' || '' }}
 
 jobs:
   unit:

.github/workflows/.windows.yml

@@ -264,6 +264,9 @@ jobs:
           - builtin
           - containerd
         test: ${{ fromJson(needs.integration-test-prepare.outputs.matrix) }}
+        exclude:
+          - storage: snapshotter
+            runtime: builtin
     env:
       GOPATH: ${{ github.workspace }}\go
       GOBIN: ${{ github.workspace }}\go\bin
@@ -354,6 +357,11 @@ jobs:
               "--exec-root=$env:TEMP\moby-exec", `
               "--pidfile=$env:TEMP\docker.pid", `
               "--register-service"
+          If ("${{ inputs.storage }}" -eq "snapshotter") {
+            # Make the env-var visible to the service-managed dockerd, as there's no CLI flag for this option.
+            & reg add "HKLM\SYSTEM\CurrentControlSet\Services\docker" /v Environment /t REG_MULTI_SZ /s '@' /d TEST_INTEGRATION_USE_SNAPSHOTTER=1 
+            echo "TEST_INTEGRATION_USE_SNAPSHOTTER=1" | Out-File -FilePath $Env:GITHUB_ENV -Encoding utf-8 -Append
+          }
           Write-Host "Starting service"
           Start-Service -Name docker
           Write-Host "Service started successfully!"
@@ -491,6 +499,9 @@ jobs:
         runtime:
           - builtin
           - containerd
+        exclude:
+          - storage: snapshotter
+            runtime: builtin
     steps:
       -
         name: Set up Go

.github/workflows/test.yml

@@ -54,15 +54,20 @@ jobs:
             *.cache-to=type=gha,scope=dev${{ matrix.mode }},mode=max
             *.output=type=cacheonly
 
+  test-prepare:
+    uses: ./.github/workflows/.test-prepare.yml
+    needs:
+      - validate-dco
+
   test:
     needs:
+      - test-prepare
       - build-dev
     uses: ./.github/workflows/.test.yml
     strategy:
       fail-fast: false
       matrix:
-        storage:
-          - graphdriver
+        storage: ${{ fromJson(needs.test-prepare.outputs.matrix) }}
     with:
       storage: ${{ matrix.storage }}
 

.github/workflows/windows-2019.yml

@@ -13,15 +13,19 @@ jobs:
   validate-dco:
     uses: ./.github/workflows/.dco.yml
 
-  run:
+  test-prepare:
+    uses: ./.github/workflows/.test-prepare.yml
     needs:
       - validate-dco
+
+  run:
+    needs:
+      - test-prepare
     uses: ./.github/workflows/.windows.yml
     strategy:
       fail-fast: false
       matrix:
-        storage:
-          - graphdriver
+        storage: ${{ fromJson(needs.test-prepare.outputs.matrix) }}
     with:
       os: windows-2019
       storage: ${{ matrix.storage }}

.github/workflows/windows-2022.yml

@@ -16,15 +16,19 @@ jobs:
   validate-dco:
     uses: ./.github/workflows/.dco.yml
 
-  run:
+  test-prepare:
+    uses: ./.github/workflows/.test-prepare.yml
     needs:
       - validate-dco
+
+  run:
+    needs:
+      - test-prepare
     uses: ./.github/workflows/.windows.yml
     strategy:
       fail-fast: false
       matrix:
-        storage:
-          - graphdriver
+        storage: ${{ fromJson(needs.test-prepare.outputs.matrix) }}
     with:
       os: windows-2022
       storage: ${{ matrix.storage }}