Fix workingDir permissions issue by creating it within init container (#283)

* Fix workingDir permissions issue by creating it within init container

* Apply suggestion from @Copilot

Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>

* rework init commands

---------

Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>

packages/k8s/src/k8s/index.ts

@@ -96,20 +96,30 @@ export async function createJobPod(
   appPod.spec.securityContext = {
     fsGroup: 1001
   }
+
+  // Extract working directory from GITHUB_WORKSPACE
+  // GITHUB_WORKSPACE is like /__w/repo-name/repo-name
+  const githubWorkspace = process.env.GITHUB_WORKSPACE
+  const workingDirPath = githubWorkspace?.split('/').slice(-2).join('/') ?? ''
+
+  const initCommands = [
+    'mkdir -p /mnt/externals',
+    'mkdir -p /mnt/work',
+    'mkdir -p /mnt/github',
+    'mv /home/runner/externals/* /mnt/externals/'
+  ]
+
+  if (workingDirPath) {
+    initCommands.push(`mkdir -p /mnt/work/${workingDirPath}`)
+  }
+
   appPod.spec.initContainers = [
     {
       name: 'fs-init',
       image:
         process.env.ACTIONS_RUNNER_IMAGE ||
         'ghcr.io/actions/actions-runner:latest',
-      command: [
-        'sh',
-        '-c',
-        `mkdir -p /mnt/externals && \\
-         mkdir -p /mnt/work && \\
-         mkdir -p /mnt/github && \\
-         mv /home/runner/externals/* /mnt/externals/`
-      ],
+      command: ['sh', '-c', initCommands.join(' && ')],
       securityContext: {
         runAsGroup: 1001,
         runAsUser: 1001