added production docker image for Tavern (#124)

.github/workflows/docker.yml

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+# Publish docker images when new releases come out
+
+name: Publish Docker Images (on release)
+
+on:
+  push:
+    branches: ['release']
+
+env:
+  REGISTRY: ghcr.io
+  IMAGE_NAME: realm/tavern
+
+jobs:
+  tavern-docker:
+    runs-on: ubuntu-latest
+    permissions:
+      contents: read
+      packages: write
+
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v3
+
+      - name: Log in to the Container registry
+        uses: docker/login-action@v2
+        with:
+          registry: ${{ env.REGISTRY }}
+          username: ${{ github.actor }}
+          password: ${{ secrets.GITHUB_TOKEN }}
+
+      - name: Extract metadata (tags, labels) for Docker
+        id: meta
+        uses: docker/metadata-action@v4
+        with:
+          images: ${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}
+
+      - name: Build and push Docker image
+        uses: docker/build-push-action@v4
+        with:
+          file: ./docker/tavern.Dockerfile
+          context: .
+          push: true
+          target: production
+          tags: ${{ steps.meta.outputs.tags }}
+          labels: ${{ steps.meta.outputs.labels }}

docker/tavern.Dockerfile

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+# Dependency Cache
+FROM golang:1.20.1-buster as base
+WORKDIR /app
+RUN mkdir -p /app/build /app/cdn
+COPY ./go.mod /app/go.mod
+COPY ./go.sum /app/go.sum
+RUN go mod download
+
+# Build Cache
+FROM base as build-cache
+COPY ./tavern /app/tavern
+
+# Production Build
+FROM build-cache as prod-build
+RUN go build -ldflags='-w -extldflags "-static"' -o /app/build/tavern ./tavern
+
+# Production
+FROM debian:buster as production
+WORKDIR /app
+CMD ["/app/tavern"]
+EXPOSE 80 443 8080
+RUN apt-get update -y && apt-get install -y ca-certificates
+COPY --from=prod-build /app/build/tavern /app/tavern