Add dockerfile and push to ghcr

.github/workflows/docker.yml

@@ -0,0 +1,57 @@
+name: Docker
+
+on:
+    push:
+        # Publish `v1.2.3` tags as releases.
+        tags:
+            - v*
+
+    # Run tests for all PRs to master.
+    pull_request:
+        branches:
+            - master
+
+jobs:
+    docker:
+        runs-on: ubuntu-latest
+        steps:
+            - uses: actions/checkout@v4
+            - uses: docker/setup-qemu-action@v3
+            - uses: docker/setup-buildx-action@v3
+            - name: Login to GitHub Container Registry
+              if: github.event_name != 'pull_request'
+              uses: docker/login-action@v3
+              with:
+                  registry: ghcr.io
+                  username: ${{ github.repository_owner }}
+                  password: ${{ secrets.GITHUB_TOKEN }}
+            - uses: docker/metadata-action@v5
+              if: github.ref_type == 'tag'
+              id: meta
+              with:
+                  images: ghcr.io/${{ github.repository }}
+                  # this will generate tags in the following format:
+                  #
+                  # latest
+                  # 1
+                  # 1.2
+                  # 1.2.3
+                  tags: |
+                      type=raw,value=latest
+                      type=semver,pattern={{major}}
+                      type=semver,pattern={{major}}.{{minor}}
+                      type=semver,pattern={{version}}
+            - uses: docker/build-push-action@v5
+              if: github.ref_type == 'tag'
+              with:
+                  context: .
+                  push: true
+                  pull: true
+                  tags: ${{ steps.meta.outputs.tags }}
+                  labels: ${{ steps.meta.outputs.labels }}
+            - uses: docker/build-push-action@v5
+              if: github.ref_type == 'branch'
+              with:
+                  context: .
+                  push: false
+                  pull: true