From 1ab187027e237c76e0a5ead874ce176998ef5512 Mon Sep 17 00:00:00 2001
From: Josh Kasuboski <josh.kasuboski@gmail.com>
Date: Mon, 22 Jun 2026 14:15:03 +0100
Subject: [PATCH] fix(ci): restore Docker build workflow
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The docker.yml workflow was dropped during the Gleam rewrite (it
replaced the entire Elixir codebase). The Dockerfile survived, but
without this workflow no images are built/published to GHCR — and the
live deployment on feedreader-2 uses ghcr.io/kasuboski/feedreader:main.

Restored with SHA-pinned actions, persist-credentials: false, and a
concurrency group.
---
 .github/workflows/docker.yml | 64 ++++++++++++++++++++++++++++++++++++
 1 file changed, 64 insertions(+)
 create mode 100644 .github/workflows/docker.yml

diff --git a/.github/workflows/docker.yml b/.github/workflows/docker.yml
new file mode 100644
index 0000000..a5cac3d
--- /dev/null
+++ b/.github/workflows/docker.yml
@@ -0,0 +1,64 @@
+name: Docker
+
+on:
+  push:
+    branches: ['**']
+    tags: ['v*.*.*']
+
+permissions:
+  contents: read
+  packages: write
+
+concurrency:
+  group: ${{ github.workflow }}-${{ github.head_ref || github.ref }}
+  cancel-in-progress: true
+
+env:
+  REGISTRY: ghcr.io
+  IMAGE_NAME: ${{ github.repository }}
+
+jobs:
+  build:
+    name: Build Multi-Arch Image
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@9c091bb21b7c1c1d1991bb908d89e4e9dddfe3e0 # v7.0.0
+        with:
+          persist-credentials: false
+
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@d7f5e7f509e45cec5c76c4d5afdd7de93d0b3df5 # v4.1.0
+        with:
+          platforms: linux/amd64,linux/arm64
+
+      - name: Extract metadata
+        id: meta
+        uses: docker/metadata-action@80c7e94dd9b9319bd5eb7a0e0fe9291e23a2a2e9 # v6.1.0
+        with:
+          images: ${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}
+          tags: |
+            type=ref,event=branch
+            type=ref,event=pr
+            type=semver,pattern={{version}}
+            type=semver,pattern={{major}}.{{minor}}
+            type=semver,pattern={{major}}
+            type=raw,value=latest,enable={{is_default_branch}}
+
+      - name: Login to GHCR
+        uses: docker/login-action@650006c6eb7dba73a995cc03b0b2d7f5ca915bee # v4.2.0
+        with:
+          registry: ${{ env.REGISTRY }}
+          username: ${{ github.actor }}
+          password: ${{ secrets.GITHUB_TOKEN }}
+
+      - name: Build and push multi-arch image
+        uses: docker/build-push-action@f9f3042f7e2789586610d6e8b85c8f03e5195baf # v7.2.0
+        with:
+          context: .
+          platforms: linux/amd64,linux/arm64
+          push: true
+          tags: ${{ steps.meta.outputs.tags }}
+          labels: ${{ steps.meta.outputs.labels }}
+          cache-from: type=gha
+          cache-to: type=gha,mode=max
+          sbom: true