Build and push Github container registry image

This will be used to generate the themes from our template repos

.github/workflows/update-docker-image.yml

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+name: Update Docker image
+on:
+  workflow_dispatch:
+
+jobs:
+  push-image:
+    name: Push latest image
+    runs-on: ubuntu-latest
+    outputs:
+      cargo_cache_key: ${{ steps.cargo_cache_key.outputs.value }}
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v4
+
+      - name: Get latest tag
+        id: get-latest-tag
+        run: echo "LATEST_TAG=$(git describe --tags --abbrev=0 --match 'v*.*.*')" >> $GITHUB_ENV
+
+      - name: Build Docker image
+        run: docker build -t tinted-builder-rust .
+
+      - name: Tag Docker image
+        run: docker tag tinted-builder-rust ghcr.io/tinted-theming/tinted-builder-rust:${{ env.LATEST_TAG }}
+
+      - name: Log in to GitHub Container Registry
+        run: echo ${{ secrets.DOCKER_GHCR }} | docker login ghcr.io -u tinted-theming-bot --password-stdin
+
+      - name: Push Docker image
+        run: docker push ghcr.io/tinted-themuing/tinted-builder-rust:${{ env.LATEST_TAG }}

Dockerfile

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+FROM rust:latest as builder
+WORKDIR /usr/src/tinted-builder-rust
+
+# Copy required compilation source
+COPY Cargo.toml Cargo.lock ./
+COPY tinted-builder ./tinted-builder
+COPY tinted-builder-rust ./tinted-builder-rust
+
+# Build and test
+RUN cargo build -p tinted-builder-rust --release
+RUN cargo test -p tinted-builder-rust --release
+
+FROM rust:latest
+COPY --from=builder /usr/src/tinted-builder-rust/target/release/tinted-builder-rust /usr/local/bin/tinted-builder-rust
+
+ENTRYPOINT ["tinted-builder-rust"]