Added publishing of docker images on release (#1135)

* Added publishing of docker images on release

* Use proper project name

---------

Co-authored-by: Cohee <18619528+Cohee1207@users.noreply.github.com>

.github/workflows/docker-publish.yml

@@ -0,0 +1,45 @@
+# This workflow will publish a docker image for every full release to the GitHub package repository
+
+name: Create Docker Image on Release
+
+on:
+  release:
+    # Only runs on full releases not pre releases
+    types: [released]
+
+env:
+  # This should allow creation of docker images even in forked repositories
+  # Image name may not contain uppercase characters, so we can not use the repository name
+  # Creates a string like: ghcr.io/SillyTavern/sillytavern
+  image_name: ghcr.io/${{ github.repository_owner }}/sillytavern
+
+jobs:
+
+  build:
+
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v3
+
+      # Build docker image using dockerfile and tag it with branch name
+      # Assumes branch name is the version number
+      - name: Build the Docker image
+        run: |
+          docker build . --file Dockerfile --tag $image_name:${{ github.ref_name }}
+
+      # Login into package repository as the person who created the release
+      - name: Login to GitHub Container Registry
+        uses: docker/login-action@v1
+        with:
+          registry: ghcr.io
+          username: ${{ github.actor }}
+          password: ${{ secrets.GITHUB_TOKEN }}
+
+      # Assumes release is the latest and marks image as such
+      - name: Docker Tag and Push
+        run: |
+          docker tag $image_name:${{ github.ref_name }} $image_name:latest
+          docker push $image_name:${{ github.ref_name }}
+          docker push $image_name:latest