fix(ci-runner): add Dockerfile for node22 CI runner image

Base image for the gitea-act-runner build environment, includes
Docker CLI and docker-compose for CI jobs that need to build/push
containers, plus corepack for yarn/pnpm support."

.gitea/runners/Dockerfile

@@ -1,7 +1,9 @@
 FROM node:22-bullseye
 
 RUN apt-get update \
-    && apt-get install -y docker.io docker-compose-plugin \
+    && apt-get install -y docker.io \
     && rm -rf /var/lib/apt/lists/*
 
-RUN corepack enable
+RUN corepack enable
+
+RUN npm install -g docker-compose