chore(workflows): rename build-docker.yml to build-nightly.yml

- Updates workflow file name to reflect nightly build process
- Ensures better alignment with intended functionality

.gitea/workflows/build-nightly.yml

@@ -0,0 +1,59 @@
+name: Build and upload Docker nightly image
+
+on:
+  workflow_dispatch:
+  push:
+    branches:
+      - main
+    paths-ignore:
+      - 'CHANGELOG.md'
+
+jobs:
+  build-and-push:
+    runs-on: ubuntu-22.04
+
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v4
+
+      - name: Restore Docker cache
+        uses: https://git.0xmax42.io/actions/cache@v1
+        with:
+          key: buildx-general
+          paths: |
+            /tmp/.buildx-cache
+
+      - name: Set up Docker Buildx
+        id: buildx
+        uses: docker/setup-buildx-action@v3
+        with:
+          driver: docker-container
+          install: true
+
+      - name: Login to Gitea Docker Registry
+        env:
+          REGISTRY: git.0xmax42.io
+          USERNAME: ${{ secrets.PACKAGE_USER }}
+          PASSWORD: ${{ secrets.PACKAGE_TOKEN }}
+        run: |
+          echo "$PASSWORD" | docker login $REGISTRY --username "$USERNAME" --password-stdin
+
+      - name: Build Docker Image
+        run: |
+          CREATED=$(date -u +%Y-%m-%dT%H:%M:%SZ)
+          VERSION_TAG=nightly-$(date +%Y%m%d)
+          docker buildx build \
+            --tag git.0xmax42.io/maxp/lt-auth-proxy:nightly \
+            --platform linux/amd64,linux/arm64 \
+            --label org.opencontainers.image.description="Lightweight LanguageTool Auth Proxy" \
+            --label org.opencontainers.image.documentation="https://git.0xmax42.io/maxp/lt-auth-proxy" \
+            --label org.opencontainers.image.authors="0xMax42 <mail@0xmax42.io>" \
+            --label org.opencontainers.image.created=$CREATED \
+            --label org.opencontainers.image.version=$VERSION_TAG \
+            --cache-from=type=local,src=/tmp/.buildx-cache \
+            --cache-to=type=local,dest=/tmp/.buildx-cache,mode=max \
+            --builder ${{ steps.buildx.outputs.name }} \
+            --push \
+            --progress=plain \
+            .
+