Optimize release workflow.

- Split Debian and Alpine into different build matrix
  This starts building both Debian and Alpine based images at the same time
- Make use of Docker BuildKit, which improves speed also.
- Use BuildKit caching for Rust Cargo across docker images.
  This prevents downloading the same crates multiple times.
- Use Github Actions Services to start a docker registry, starting it
via the build script sometimes caused issues.
- Updated the Build workflow to use Ubuntu 20.04 which is more close to
the Bullseye Debian release regarding package versions.

.github/workflows/release.yml

@@ -31,7 +31,7 @@ jobs:
     steps:
       - name: Skip Duplicates Actions
         id: skip_check
-        uses: fkirc/skip-duplicate-actions@master
+        uses: fkirc/skip-duplicate-actions@f75dd6564bb646f95277dc8c3b80612e46a4a1ea # v3.4.1
         with:
           cancel_others: 'true'
         # Only run this when not creating a tag
@@ -40,23 +40,33 @@ jobs:
   docker-build:
     runs-on: ubuntu-latest
     needs: skip_check
-    if: ${{ needs.skip_check.outputs.should_skip != 'true' }}
+    # Start a local docker registry to be used to generate multi-arch images.
+    services:
+      registry:
+        image: registry:2
+        ports:
+          - 5000:5000
     env:
-      # DOCKER_BUILDKIT: 1 # Disabled for now, but we should look at this because it will speedup building!
+      DOCKER_BUILDKIT: 1 # Disabled for now, but we should look at this because it will speedup building!
       # DOCKER_REPO/secrets.DOCKERHUB_REPO needs to be 'index.docker.io/<user>/<repo>'
       DOCKER_REPO: ${{ secrets.DOCKERHUB_REPO }}
       SOURCE_COMMIT: ${{ github.sha }}
       SOURCE_REPOSITORY_URL: "https://github.com/${{ github.repository }}"
+    if: ${{ needs.skip_check.outputs.should_skip != 'true' && github.repository == 'dani-garcia/vaultwarden' }}
+    strategy:
+      matrix:
+        base_image: ["debian","alpine"]
+
     steps:
       # Checkout the repo
       - name: Checkout
-        uses: actions/checkout@v2
+        uses: actions/checkout@5a4ac9002d0be2fb38bd78e4b4dbde5606d7042f # v2.3.4
         with:
           fetch-depth: 0
 
       # Login to Docker Hub
       - name: Login to Docker Hub
-        uses: docker/login-action@v1
+        uses: docker/login-action@f054a8b539a109f9f41c372932f1ae047eff08c9 # v1.10.0
         with:
           username: ${{ secrets.DOCKERHUB_USERNAME }}
           password: ${{ secrets.DOCKERHUB_TOKEN }}
@@ -79,16 +89,18 @@ jobs:
       - name: Build Debian based images
         shell: bash
         env:
-          DOCKER_TAG: ${{steps.vars.outputs.DOCKER_TAG}}
+          DOCKER_TAG: "${{steps.vars.outputs.DOCKER_TAG}}"
         run: |
           ./hooks/build
+        if: ${{ matrix.base_image == 'debian' }}
 
       - name: Push Debian based images
         shell: bash
         env:
-          DOCKER_TAG: ${{steps.vars.outputs.DOCKER_TAG}}
+          DOCKER_TAG: "${{steps.vars.outputs.DOCKER_TAG}}"
         run: |
           ./hooks/push
+        if: ${{ matrix.base_image == 'debian' }}
 
       - name: Build Alpine based images
         shell: bash
@@ -96,6 +108,7 @@ jobs:
           DOCKER_TAG: "${{steps.vars.outputs.DOCKER_TAG}}-alpine"
         run: |
           ./hooks/build
+        if: ${{ matrix.base_image == 'alpine' }}
 
       - name: Push Alpine based images
         shell: bash
@@ -103,3 +116,4 @@ jobs:
           DOCKER_TAG: "${{steps.vars.outputs.DOCKER_TAG}}-alpine"
         run: |
           ./hooks/push
+        if: ${{ matrix.base_image == 'alpine' }}