added jenkins-agent image

.gitea/workflows/build-jenkins-agent.yaml

@@ -0,0 +1,35 @@
+name: CI
+on:
+  push:
+    branches: [ master ]
+    paths:
+      - 'jenkins-agent/*'
+      - '.gitea/workflows/build-jenkins-agent.yaml'      
+jobs:
+  "Build jenkins-agent docker images":
+    runs-on: woryzen
+    steps:
+      -
+        name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v3.4.0
+        with:
+          driver: docker-container
+      -
+        name: Login to Gitea container registry
+        uses: docker/login-action@v3
+        with:
+          registry: gitea.woggioni.net
+          username: woggioni
+          password: ${{ secrets.PUBLISHER_TOKEN }}
+      -
+        name: Build and push jenkins-agent images
+        uses: docker/build-push-action@v6
+        with:
+          context: "{{defaultContext}}:jenkins-agent"
+          push: true
+          pull: true
+          tags: |
+            "gitea.woggioni.net/woggioni/jenkins-agent:latest"
+          cache-from: type=registry,ref=gitea.woggioni.net/woggioni/jenkins-agent:buildx
+          cache-to: type=registry,mode=max,compression=zstd,image-manifest=true,oci-mediatypes=true,ref=gitea.woggioni.net/woggioni/jenkins-agent:buildx          
+

jenkins-agent/Dockerfile

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+FROM jenkins/agent:alpine-jdk21
+USER root
+RUN --mount=type=cache,target=/var/cache/apk apk add docker
+USER jenkins