From 8e495662cd8e32967f50ae54555952361d4a0fa8 Mon Sep 17 00:00:00 2001
From: Christopher Obbard <chris@64studio.com>
Date: Sun, 21 Aug 2022 11:12:11 +0100
Subject: [PATCH] Build Docker container in GitHub actions

For each branch, build a docker container inside GitHub
actions and push the resultant image to GitHub container
registry.

Builds from the default branch are tagged as latest, while
branches and tags also are pushed to the container registry
to keep the container history tied to the repository
metadata.

Signed-off-by: Christopher Obbard <chris@64studio.com>
---
 .github/workflows/build-docker.yaml | 51 +++++++++++++++++++++++++++++
 1 file changed, 51 insertions(+)
 create mode 100644 .github/workflows/build-docker.yaml

diff --git a/.github/workflows/build-docker.yaml b/.github/workflows/build-docker.yaml
new file mode 100644
index 0000000..fc0a09d
--- /dev/null
+++ b/.github/workflows/build-docker.yaml
@@ -0,0 +1,51 @@
+name: Build Docker container
+
+env:
+  GITHUB_TAG: ghcr.io/${{ github.repository }}
+
+on:
+  push:
+    branches-ignore:
+      - '*.tmp'
+    tags:
+      - '*'
+  pull_request:
+  workflow_dispatch:
+
+jobs:
+  docker:
+    name: Build Docker container
+    runs-on: ubuntu-latest
+    steps:
+      - name: Set up QEMU
+        uses: docker/setup-qemu-action@v2
+
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v2
+
+      - name: Login to GitHub Container Registry
+        uses: docker/login-action@v2
+        with:
+          registry: ghcr.io
+          username: ${{ github.repository_owner }}
+          password: ${{ secrets.GITHUB_TOKEN }}
+
+      - name: Extract Docker metadata
+        id: meta
+        uses: docker/metadata-action@v4
+        with:
+          images: ${{ env.GITHUB_TAG }}
+          tags: |
+            "type=ref,event=branch"
+            "type=ref,suffix=-{{sha}},event=branch"
+            "type=ref,suffix=-{{date 'YYYYMMDD'}},event=branch"
+            "type=ref,event=tag"
+            "type=ref,event=pr"
+            "type=raw,value=latest,enable={{is_default_branch}}"
+
+      - name: Build and push
+        uses: docker/build-push-action@v3
+        with:
+          push: true
+          tags: ${{ steps.meta.outputs.tags }}
+          labels: ${{ steps.meta.outputs.labels }}