CNTRLPLANE-3329: Extend EFS-backed build cache to lint, verify, and envtest workflows

.github/actions/warm-go-cache/action.yaml

@@ -0,0 +1,13 @@
+name: 'Warm Go build cache'
+description: 'Set GOCACHE and optionally warm from EFS-backed PV'
+runs:
+  using: composite
+  steps:
+    - shell: bash
+      run: |
+        echo "GOCACHE=/tmp/go-build-cache" >> "$GITHUB_ENV"
+        if [ -d /cache/go-build ]; then
+          mkdir -p /tmp/go-build-cache && \
+          cp -a /cache/go-build/. /tmp/go-build-cache/ || \
+          echo "Warning: failed to copy EFS cache, proceeding without cache"
+        fi

.github/workflows/envtest-kube-reusable.yaml

@@ -57,6 +57,7 @@ jobs:
       - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2
         with:
           persist-credentials: false
+      - uses: ./.github/actions/warm-go-cache
       - run: make test-envtest-kube ENVTEST_KUBE_VERSIONS="${{ matrix.version }}"
 
   conclusion:

.github/workflows/envtest-ocp-reusable.yaml

@@ -58,6 +58,7 @@ jobs:
       - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2
         with:
           persist-credentials: false
+      - uses: ./.github/actions/warm-go-cache
       - run: make test-envtest-ocp ENVTEST_OCP_K8S_VERSIONS="${{ matrix.version }}"
 
   conclusion:

.github/workflows/lint-reusable.yaml

@@ -20,6 +20,7 @@ jobs:
           if [ -n "${{ github.base_ref }}" ]; then
             git fetch origin "${{ github.base_ref }}:${{ github.base_ref }}"
           fi
+      - uses: ./.github/actions/warm-go-cache
       - name: Use pre-built lint tools
         run: |
           if [ -d /opt/lint-tools ]; then

.github/workflows/verify-reusable.yaml

@@ -15,6 +15,7 @@ jobs:
       - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2
         with:
           persist-credentials: false
+      - uses: ./.github/actions/warm-go-cache
       - run: make generate update
       - run: make staticcheck
       - run: make fmt