docker: providing a docker image (#6)

Author: sravotto

.github/workflows/docker.yaml

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+# Copyright 2025 Cockroach Labs, Inc.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+
+name: Docker
+permissions:
+  contents: read
+on:
+  push:
+    tags: [ 'v*.*.*' ]
+  # PR's will trigger an image build, but the push action is disabled.
+  pull_request:
+  workflow_dispatch:
+    inputs:
+      build_binaries:
+        description: 'Docker'
+        type: boolean
+        required: false
+jobs:
+  docker:
+    runs-on: ubuntu-latest
+    permissions:
+      contents: read
+      packages: write
+      attestations: write
+      id-token: write
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+      - name: Set up QEMU
+        uses: docker/setup-qemu-action@v3
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v3
+      - name: Login to ghcr.io
+        if: github.event_name != 'pull_request'
+        uses: docker/login-action@65b78e6e13532edd9afa3aa52ac7964289d1a9c1
+        with:
+          registry: ghcr.io
+          username: ${{ github.actor }}
+          password: ${{ secrets.GITHUB_TOKEN }}
+      - name: Docker meta
+        id: meta
+        uses: docker/metadata-action@9ec57ed1fcdbf14dcef7dfbe97b2010124a938b7
+        with:
+          images: ghcr.io/${{ github.repository }}
+          tags: |
+            type=ref,event=branch
+            type=ref,event=tag
+            type=sha
+          labels: |
+            org.opencontainers.image.title=Blobcheck
+            org.opencontainers.image.vendor=Cockroach Labs Inc.
+            org.opencontainers.image.descripton=Prototype, not officially supported
+      - name: Build and push
+        uses: docker/build-push-action@f2a1d5e99d037542a71f64918e516c093c6f3fc4
+        with:
+          context: .
+          platforms: linux/amd64,linux/arm64
+          push: ${{ github.event_name != 'pull_request' }}
+          tags: ${{ steps.meta.outputs.tags }}
+          labels: ${{ steps.meta.outputs.labels }}

Dockerfile

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+# Copyright 2025 Cockroach Labs, Inc.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+
+FROM golang:1.24.6-alpine3.21 AS builder
+WORKDIR /tmp/compile
+COPY . .
+RUN CGO_ENABLED=0 go build -v -ldflags="-s -w " -o /usr/bin/blobcheck .
+
+FROM scratch
+WORKDIR /data/
+ENTRYPOINT ["/usr/bin/blobcheck"]
+COPY --from=builder /usr/bin/blobcheck /usr/bin/