Add CI

.github/workflows/ci.yml

@@ -0,0 +1,36 @@
+# .github/workflows/ci.yml
+
+name: CI
+
+on:
+  push:
+  pull_request:
+    branches: [main]
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    env:
+      MY_DOCKER_USERNAME: ${{ secrets.MY_DOCKER_USERNAME }}
+      MY_DOCKER_PASSWORD: ${{ secrets.MY_DOCKER_PASSWORD }}
+      FORCE_COLOR: 1
+    steps:
+      - uses: https://github.com/earthly/actions-setup@v1
+        with:
+          version: v0.7.0
+      - uses: actions/checkout@v2
+      - name: Put back the git branch into git (Earthly uses it for tagging)
+        run: |
+          branch=""
+          if [ -n "$GITHUB_HEAD_REF" ]; then
+            branch="$GITHUB_HEAD_REF"
+          else
+            branch="${GITHUB_REF##*/}"
+          fi
+          git checkout -b "$branch" || true
+      - name: Docker Login
+        run: docker login git.hibas.dev --username "$MY_DOCKER_USERNAME" --password "$MY_DOCKER_PASSWORD"
+      - name: Earthly version
+        run: earthly --version
+      - name: Run build
+        run: cd registry &&  earthly --push +docker-multi