feat: release automation and doc fixes (#238)

* fix: align env vars and config paths in CI and contributing docs

* feat: add automatic docker publishing to ghcr workflow

---------

Co-authored-by: ralksta <ralksta@users.noreply.github.com>

.github/workflows/docker-publish.yml

@@ -0,0 +1,57 @@
+name: Publish Docker Image
+
+on:
+  release:
+    types: [published]
+  workflow_dispatch:
+
+env:
+  REGISTRY: ghcr.io
+  IMAGE_NAME: ${{ github.repository }}
+
+jobs:
+  build-and-push:
+    runs-on: ubuntu-latest
+    permissions:
+      contents: read
+      packages: write
+
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v4
+
+      - name: Set up QEMU
+        uses: docker/setup-qemu-action@v3
+
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v3
+
+      - name: Log in to the Container registry
+        uses: docker/login-action@v3
+        with:
+          registry: ${{ env.REGISTRY }}
+          username: ${{ github.actor }}
+          password: ${{ secrets.GITHUB_TOKEN }}
+
+      - name: Extract metadata (tags, labels) for Docker
+        id: meta
+        uses: docker/metadata-action@v5
+        with:
+          images: ${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}
+          tags: |
+            type=semver,pattern={{version}}
+            type=semver,pattern={{major}}.{{minor}}
+            type=semver,pattern={{major}}
+            type=ref,event=branch
+            type=sha,format=long
+            type=raw,value=latest,enable=${{ github.event_name == 'release' }}
+
+      - name: Build and push Docker image
+        uses: docker/build-push-action@v5
+        with:
+          context: .
+          push: true
+          tags: ${{ id.meta.outputs.tags }}
+          labels: ${{ id.meta.outputs.labels }}
+          cache-from: type=gha
+          cache-to: type=gha,mode=max