Bake pnpm into runner image, fix config loading with --config flag

Pre-install pnpm 9.15.4 via corepack in the image so it doesn't
download every run. Use --config CLI flag instead of CONFIG_FILE
env var to ensure container.options volume mount is applied.

infra/kubernetes/platform/gitea-runner/Dockerfile.runner-image

@@ -7,4 +7,5 @@ RUN apt-get update && apt-get install -y --no-install-recommends \
     docker.io \
   && curl -sL https://github.com/kubernetes-sigs/kustomize/releases/download/kustomize%2Fv5.6.0/kustomize_v5.6.0_linux_amd64.tar.gz \
     | tar xz -C /usr/local/bin \
+  && corepack enable && corepack prepare pnpm@9.15.4 --activate \
   && apt-get clean && rm -rf /var/lib/apt/lists/*

infra/kubernetes/platform/gitea-runner/deployment.yaml

@@ -18,6 +18,7 @@ spec:
       containers:
         - name: runner
           image: gitea/act_runner:latest
+          command: ["act_runner", "daemon", "--config", "/config/config.yaml"]
           env:
             - name: GITEA_INSTANCE_URL
               value: http://gitea-helm-http.platform.svc:3000
@@ -30,8 +31,6 @@ spec:
               value: "ubuntu-latest:docker://gitea.coreworlds.io/lazorgurl/runner-image:latest,linux/amd64:docker://gitea.coreworlds.io/lazorgurl/runner-image:latest,cluster:docker://gitea.coreworlds.io/lazorgurl/runner-image:latest"
             - name: DOCKER_HOST
               value: tcp://localhost:2375
-            - name: CONFIG_FILE
-              value: /config/config.yaml
           volumeMounts:
             - name: runner-data
               mountPath: /data