ci: Enable apt caching for container builds

The Dockerfile is already prepared and works locally. Now also make use
of that on github.

Signed-off-by: Jan Kiszka <[email protected]>

.github/actions/docker-init/action.yml

@@ -18,3 +18,27 @@ runs:
         registry: ghcr.io
         username: ${{ inputs.deploy-user }}
         password: ${{ inputs.deploy-token }}
+    - name: Cache var-cache-apt
+      id: cache-var-cache-apt
+      uses: actions/cache@v4
+      with:
+        path: var-cache-apt
+        key: var-cache-apt-${{ hashFiles('Dockerfile') }}
+    - name: Cache var-lib-apt
+      id: cache-var-lib-apt
+      uses: actions/cache@v4
+      with:
+        path: var-lib-apt
+        key: var-lib-apt-${{ hashFiles('Dockerfile') }}
+    - name: Inject var-cache-apt into docker
+      uses: reproducible-containers/[email protected]
+      with:
+        cache-source: var-cache-apt
+        cache-target: /var/cache/apt
+        skip-extraction: ${{ steps.cache-var-cache-apt.outputs.cache-hit }}
+    - name: Inject var-lib-apt into docker
+      uses: reproducible-containers/[email protected]
+      with:
+        cache-source: var-lib-apt
+        cache-target: /var/lib/apt
+        skip-extraction: ${{ steps.cache-var-lib-apt.outputs.cache-hit }}

.github/workflows/master.yml

@@ -31,13 +31,17 @@ jobs:
         uses: docker/build-push-action@v5
         with:
           context: .
+          cache-from: type=gha
+          cache-to: type=gha,mode=max
           platforms: linux/amd64,linux/arm64
           push: ${{ env.PUSH_MASTER }}
           tags: ghcr.io/siemens/kas/kas
       - name: Build kas-isar image
         uses: docker/build-push-action@v5
         with:
           context: .
+          cache-from: type=gha
+          cache-to: type=gha,mode=max
           target: kas-isar
           platforms: linux/amd64,linux/arm64
           push: ${{ env.PUSH_MASTER }}

.github/workflows/next.yml

@@ -77,6 +77,8 @@ jobs:
         uses: docker/build-push-action@v5
         with:
           context: .
+          cache-from: type=gha
+          cache-to: type=gha,mode=max
           load: true
           tags: ghcr.io/siemens/kas/kas:next
       - name: Test kas image
@@ -87,13 +89,17 @@ jobs:
         uses: docker/build-push-action@v5
         with:
           context: .
+          cache-from: type=gha
+          cache-to: type=gha,mode=max
           platforms: linux/amd64,linux/arm64
           tags: ghcr.io/siemens/kas/kas:next
           push: true
       - name: Build kas-isar image
         uses: docker/build-push-action@v5
         with:
           context: .
+          cache-from: type=gha
+          cache-to: type=gha,mode=max
           target: kas-isar
           load: true
           tags: ghcr.io/siemens/kas/kas-isar:next
@@ -105,6 +111,8 @@ jobs:
         uses: docker/build-push-action@v5
         with:
           context: .
+          cache-from: type=gha
+          cache-to: type=gha,mode=max
           target: kas-isar
           platforms: linux/amd64,linux/arm64
           tags: ghcr.io/siemens/kas/kas-isar:next

.github/workflows/release.yml

@@ -23,6 +23,8 @@ jobs:
         uses: docker/build-push-action@v5
         with:
           context: .
+          cache-from: type=gha
+          cache-to: type=gha,mode=max
           platforms: linux/amd64,linux/arm64
           push: true
           tags: |
@@ -33,6 +35,8 @@ jobs:
         uses: docker/build-push-action@v5
         with:
           context: .
+          cache-from: type=gha
+          cache-to: type=gha,mode=max
           target: kas-isar
           platforms: linux/amd64,linux/arm64
           push: true