ci: add cache benchmark workflow to compare GHA vs registry cache

Author: izadoesdev

.github/workflows/cache-benchmark.yml

@@ -0,0 +1,81 @@
+name: Cache Benchmark
+
+on:
+  workflow_dispatch:
+
+env:
+  REGISTRY: ghcr.io
+  IMAGE_PREFIX: ghcr.io/databuddy-analytics/databuddy
+
+jobs:
+  gha-cache:
+    name: "GHA cache (links, amd64)"
+    runs-on: blacksmith-4vcpu-ubuntu-2404
+    timeout-minutes: 15
+    permissions:
+      contents: read
+      packages: write
+    steps:
+      - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6
+
+      - name: Mount Docker build cache
+        uses: useblacksmith/stickydisk@41873b1513bb679f9c115504cbd13d3660432504 # v1
+        with:
+          key: ${{ github.repository }}-cache-bench-gha
+          path: /tmp/docker-build-cache
+
+      - name: Set up Docker Builder
+        uses: useblacksmith/setup-docker-builder@ac083cc84672d01c60d5e8561d0a939b697de542 # v1
+
+      - uses: docker/login-action@4907a6ddec9925e35a0a9e82d7399ccc52663121 # v4
+        with:
+          registry: ${{ env.REGISTRY }}
+          username: ${{ github.actor }}
+          password: ${{ secrets.GITHUB_TOKEN }}
+
+      - name: Build with GHA cache
+        uses: useblacksmith/build-push-action@cbd1f60d194a98cb3be5523b15134501eaf0fbf3 # v2
+        with:
+          context: .
+          file: links.Dockerfile
+          push: false
+          platforms: linux/amd64
+          tags: bench:gha-cache
+          cache-from: type=gha,scope=bench-gha
+          cache-to: type=gha,mode=max,scope=bench-gha
+
+  registry-cache:
+    name: "Registry cache (links, amd64)"
+    runs-on: blacksmith-4vcpu-ubuntu-2404
+    timeout-minutes: 15
+    permissions:
+      contents: read
+      packages: write
+    steps:
+      - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6
+
+      - name: Mount Docker build cache
+        uses: useblacksmith/stickydisk@41873b1513bb679f9c115504cbd13d3660432504 # v1
+        with:
+          key: ${{ github.repository }}-cache-bench-registry
+          path: /tmp/docker-build-cache
+
+      - name: Set up Docker Builder
+        uses: useblacksmith/setup-docker-builder@ac083cc84672d01c60d5e8561d0a939b697de542 # v1
+
+      - uses: docker/login-action@4907a6ddec9925e35a0a9e82d7399ccc52663121 # v4
+        with:
+          registry: ${{ env.REGISTRY }}
+          username: ${{ github.actor }}
+          password: ${{ secrets.GITHUB_TOKEN }}
+
+      - name: Build with registry cache
+        uses: useblacksmith/build-push-action@cbd1f60d194a98cb3be5523b15134501eaf0fbf3 # v2
+        with:
+          context: .
+          file: links.Dockerfile
+          push: false
+          platforms: linux/amd64
+          tags: bench:registry-cache
+          cache-from: type=registry,ref=${{ env.IMAGE_PREFIX }}-links:cache-bench
+          cache-to: type=registry,ref=${{ env.IMAGE_PREFIX }}-links:cache-bench,mode=max