Adds workflow to publish container image to dockerhub and ghcr

Author: lorengordon

.github/workflows/publish.yml

@@ -0,0 +1,61 @@
+name: Publish Docker Image
+
+on:
+  # Run on push to default branch
+  push:
+    branches:
+      - main
+      - master
+
+  # Run when a release is created
+  release:
+    types: [released]
+
+jobs:
+  docker:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Docker meta
+        id: meta
+        uses: docker/metadata-action@902fa8ec7d6ecbf8d84d538b9b233a880e428804
+        with:
+          # list of Docker images to use as base name for tags
+          images: |
+            plus3it/tardigrade-ci
+            ghcr.io/plus3it/tardigrade-ci
+          flavor: |
+            latest=false
+          # generate Docker tags based on the following events/attributes
+          tags: |
+            # set latest tag for default branch
+            type=raw,value=latest,enable={{is_default_branch}}
+            # set version tags for releases
+            type=semver,pattern={{version}}
+            type=semver,pattern={{major}}.{{minor}}
+            type=semver,pattern={{major}}
+
+      - name: Login to Docker Hub
+        uses: docker/login-action@74a5d142397b4f367a81961eba4e8cd7edddf772
+        with:
+          username: ${{ vars.DOCKERHUB_USERNAME }}
+          password: ${{ secrets.DOCKERHUB_TOKEN }}
+
+      - name: Login to GitHub Container Registry
+        uses: docker/login-action@74a5d142397b4f367a81961eba4e8cd7edddf772
+        with:
+          registry: ghcr.io
+          username: ${{ github.repository_owner }}
+          password: ${{ secrets.GITHUB_TOKEN }}
+
+      - name: Set up QEMU
+        uses: docker/setup-qemu-action@29109295f81e9208d7d86ff1c6c12d2833863392
+
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@b5ca514318bd6ebac0fb2aedd5d36ec1b5c232a2
+
+      - name: Build and push
+        uses: docker/build-push-action@14487ce63c7a62a4a324b0bfb37086795e31c6c1
+        with:
+          push: true
+          tags: ${{ steps.meta.outputs.tags }}
+          labels: ${{ steps.meta.outputs.labels }}

.github/workflows/release.yml

@@ -4,7 +4,7 @@ on:
   # Run on demand
   workflow_dispatch:
 
-  # Run on push to main when .bumpversion.cfg version is updated
+  # Run on push to default branch when .bumpversion.cfg version is updated
   push:
     branches:
       - main