initial attempt at ubuntu image build workflow

.github/workflows/build-ubuntu.yaml

@@ -0,0 +1,102 @@
+name: Build and push Ubuntu image
+
+on:
+  push:
+    tags:
+      - 'v*.*.*'
+    paths:
+      - ubuntu/**
+  schedule:
+    - cron: "0 0 * * 1" # Every Monday at 00:00
+  workflow_dispatch:
+
+env:
+  REGISTRY: docker.io
+  IMAGE_OWNER: glitchcrab
+  IMAGE_NAME: ubuntu-debug
+
+jobs:
+  debug_info:
+    name: Debug info
+    runs-on: self-hosted
+    steps:
+      - name: Print github context JSON
+        run: |
+          cat <<EOF
+          ${{ toJson(github) }}
+          EOF
+
+  build-on-push-trigger:
+    runs-on: self-hosted
+    if: github.event_name == 'push'
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      - name: Setup Docker buildx
+        uses: docker/setup-buildx-action@v3
+
+      - name: Log into registry ${{ env.REGISTRY }}
+        if: github.event_name != 'pull_request'
+        uses: docker/login-action@v3
+        with:
+          registry: ${{ env.REGISTRY }}
+          username: ${{ env.IMAGE_OWNER }}
+          password: ${{ secrets.DOCKERHUB_TOKEN_UBUNTU }}
+
+      - name: Extract Docker metadata
+        id: meta
+        uses: docker/metadata-action@v5
+        with:
+          images: ${{ env.REGISTRY }}/${{ env.IMAGE_OWNER }}/${{ env.IMAGE_NAME }}
+          tags: |
+            type=semver,pattern={{raw}}
+            type=schedule,pattern={{date 'YYYYMMDD'}}
+            type=raw,value=latest
+
+      - name: Build and push Docker image
+        id: build-and-push
+        uses: docker/build-push-action@v5
+        with:
+          context: "./ubuntu"
+          tags: ${{ steps.meta.outputs.tags }}
+          labels: ${{ steps.meta.outputs.labels }}
+          cache-from: type=gha
+          cache-to: type=gha,mode=max
+
+  build-on-any-other-trigger:
+    runs-on: self-hosted
+    if: github.event_name != 'push'
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      - name: Setup Docker buildx
+        uses: docker/setup-buildx-action@v3
+
+      - name: Log into registry ${{ env.REGISTRY }}
+        if: github.event_name != 'pull_request'
+        uses: docker/login-action@v3
+        with:
+          registry: ${{ env.REGISTRY }}
+          username: ${{ env.IMAGE_OWNER }}
+          password: ${{ secrets.DOCKERHUB_TOKEN_UBUNTU }}
+
+      - name: Extract Docker metadata
+        id: meta
+        uses: docker/metadata-action@v5
+        with:
+          images: ${{ env.REGISTRY }}/${{ env.IMAGE_OWNER }}/${{ env.IMAGE_NAME }}
+          tags: |
+            type=schedule,pattern={{date 'YYYYMMDD'}}
+            type=raw,value=latest
+
+      - name: Build and push Docker image
+        id: build-and-push
+        uses: docker/build-push-action@v5
+        with:
+          context: "./ubuntu"
+          tags: ${{ steps.meta.outputs.tags }}
+          labels: ${{ steps.meta.outputs.labels }}
+          cache-from: type=gha
+          cache-to: type=gha,mode=max

CHANGELOG.md

@@ -7,7 +7,9 @@ and this project's packages adheres to [Semantic Versioning](http://semver.org/s
 
 ## Unreleased
 
-### Changed
+### Added
+
+- Initial attempt at a build workflow for Ubuntu.
 
 ## [v1.0.0] - 2020-08-15