Add custom image and push action

.forgejo/workflows/build.yml

@@ -0,0 +1,49 @@
+name: Build and Publish Docker Image
+
+on:
+  push:
+    branches:
+      - main
+
+env:
+  REGISTRY: stackit-solutions.git.onstackit.cloud
+  IMAGE_NAME: ${{ github.repository }}
+
+jobs:
+  build-and-push:
+    runs-on: lxc
+    permissions:
+      packages: write
+      contents: read
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v4
+
+      - name: Set up Docker
+        run: |
+          curl -fsSL https://get.docker.com -o get-docker.sh
+          sudo sh get-docker.sh
+
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v3
+
+      - name: Log in to Container Registry
+        uses: docker/login-action@v3
+        with:
+          registry: ${{ env.REGISTRY }}
+          username: ${{ github.actor }}
+          password: ${{ secrets.GITHUB_TOKEN }}
+
+      - name: Extract base image version
+        id: version
+        run: |
+          VERSION=$(sed -n 's/^FROM .*:\(.*\)$/\1/p' Dockerfile)
+          echo "version=$VERSION" >> $GITHUB_OUTPUT
+
+      - name: Build and push Docker image
+        id: push
+        uses: docker/build-push-action@v5
+        with:
+          context: .
+          push: true
+          tags: ${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}:${{ steps.version.outputs.version }}

Dockerfile

@@ -0,0 +1,17 @@
+FROM doctoolchain/doctoolchain:v3.4.2
+
+RUN curl -fsSL https://d2lang.com/install.sh | sh -s --
+
+USER root
+RUN mv /home/dtcuser/.local/bin/d2 /usr/local/bin/d2
+
+COPY zscaler.crt /usr/local/share/ca-certificates/zscaler.crt
+RUN update-ca-certificates && \
+    keytool -importcert -file /usr/local/share/ca-certificates/zscaler.crt -alias /usr/local/share/ca-certificates/zscaler.crt -cacerts -storepass changeit -noprompt
+
+RUN mkdir /usr/local/structurizr && \
+    wget https://github.com/structurizr/cli/releases/latest/download/structurizr-cli.zip -O /usr/local/structurizr/structurizr-cli.zip && \
+    unzip /usr/local/structurizr/structurizr-cli.zip -d /usr/local/structurizr
+
+USER dtcuser
+ENV DIAGRAM_STRUCTURIZRCLI_HOME=/usr/local/structurizr

zscaler.crt

@@ -0,0 +1,28 @@
+-----BEGIN CERTIFICATE-----
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+VQQGEwJVUzETMBEGA1UECBMKQ2FsaWZvcm5pYTERMA8GA1UEBxMIU2FuIEpvc2Ux
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+pB5iDj2mUZH1T8lzYtuZy0ZPirxmtsk3135+CKNa2OCAhhFjE0xd
+-----END CERTIFICATE-----