feat: migrate renovate image

.gitea/workflows/image_builds.yaml

@@ -1,5 +1,5 @@
 ---
-name: act runner
+name: Image builds
 on:
   schedule:
     - cron: '21 2 * * *'
@@ -8,7 +8,12 @@ on:
       - main
 
 jobs:
-  build-act-runner:
+  build_images:
+    strategy:
+      matrix:
+        image:
+          - act_runtime
+          - renovate
     runs-on: ubuntu-latest
     steps:
       - name: Checkout
@@ -26,6 +31,6 @@ jobs:
       - name: Build and push
         uses: docker/build-push-action@v5
         with:
-          context: "./act_runner"
+          context: "./${{  matrix.image }}"
           push: true
-          tags: code.icb4dc0.de/infrastructure/images/act_runtime:latest
+          tags: code.icb4dc0.de/infrastructure/images/${{ matrix.image }}:latest

renovate/Dockerfile

@@ -0,0 +1,11 @@
+FROM docker.io/golang:1.21-alpine AS go-tools-builder
+
+RUN go install github.com/marwan-at-work/mod/cmd/mod@latest
+
+FROM docker.io/node:lts-alpine
+
+COPY --from=go-tools-builder /go/bin/ /usr/local/bin/
+
+RUN npm install -g renovate && \
+    echo "http://dl-cdn.alpinelinux.org/alpine/edge/community" >> /etc/apk/repositories && \
+    apk add -U --no-cache git go re2