Fix: Add dummy volume to force k8s-novolume hook prepare script execution

internal/runner/template_spec/testdata/expected/privileged_basic.yaml

@@ -293,6 +293,8 @@ data:
           mountPath: /lib64
         - name: glibc-compat
           mountPath: /lib/x86_64-linux-gnu
+        - name: dummy-prepare-trigger
+          mountPath: /tmp/dummy-prepare
       volumes:
       - name: sys
         hostPath:
@@ -320,6 +322,8 @@ data:
           type: Directory
       - name: glibc-compat
         emptyDir: {}
+      - name: dummy-prepare-trigger
+        emptyDir: {}
 ---
 apiVersion: actions.github.com/v1alpha1
 kind: AutoscalingRunnerSet

internal/runner/template_spec/testdata/expected/privileged_multi_cache.yaml

@@ -297,6 +297,8 @@ data:
           mountPath: /var/lib/docker
         - name: cache-1
           mountPath: /nix/store
+        - name: dummy-prepare-trigger
+          mountPath: /tmp/dummy-prepare
       volumes:
       - name: sys
         hostPath:
@@ -332,6 +334,8 @@ data:
         hostPath:
           path: /nix/store
           type: DirectoryOrCreate
+      - name: dummy-prepare-trigger
+        emptyDir: {}
 ---
 apiVersion: actions.github.com/v1alpha1
 kind: AutoscalingRunnerSet

pkg/templates/templates/overlay.yaml

@@ -76,6 +76,11 @@
 #@     volumeMounts.append({"name": "cache-" + str(i), "mountPath": cachePath.target})
 #@   end
 #@   
+#@   # WORKAROUND: Add dummy user mount volume to force k8s-novolume hook prepare script execution
+#@   # The prepare script only runs when userMountVolumes exist, but it's needed to copy /github/workflow content
+#@   # See: https://github.com/rkoster/deskrun/issues/26
+#@   volumeMounts.append({"name": "dummy-prepare-trigger", "mountPath": "/tmp/dummy-prepare"})
+#@   
 #@   # Note: externals (/__e), work (/__w), and github (/github) volumes are automatically
 #@   # added by the k8s-novolume hooks, so we don't include them here to avoid duplicates.
 #@   # The hooks handle all GitHub workspace paths including /github/workflow/event.json
@@ -109,6 +114,9 @@
 #@     volumes.append({"name": "cache-" + str(i), "hostPath": {"path": cache_source, "type": "DirectoryOrCreate"}})
 #@   end
 #@   
+#@   # WORKAROUND: Dummy volume to trigger prepare script (see volumeMounts comment above)
+#@   volumes.append({"name": "dummy-prepare-trigger", "emptyDir": {}})
+#@   
 #@   spec["containers"] = [container]
 #@   spec["volumes"] = volumes
 #@   

pkg/templates/testdata/expected/privileged_basic.yaml

@@ -293,6 +293,8 @@ data:
           mountPath: /lib64
         - name: glibc-compat
           mountPath: /lib/x86_64-linux-gnu
+        - name: dummy-prepare-trigger
+          mountPath: /tmp/dummy-prepare
       volumes:
       - name: sys
         hostPath:
@@ -320,6 +322,8 @@ data:
           type: Directory
       - name: glibc-compat
         emptyDir: {}
+      - name: dummy-prepare-trigger
+        emptyDir: {}
 ---
 apiVersion: actions.github.com/v1alpha1
 kind: AutoscalingRunnerSet

pkg/templates/testdata/expected/privileged_emptydir_cache.yaml

@@ -295,6 +295,8 @@ data:
           mountPath: /lib/x86_64-linux-gnu
         - name: cache-0
           mountPath: /var/lib/docker
+        - name: dummy-prepare-trigger
+          mountPath: /tmp/dummy-prepare
       volumes:
       - name: sys
         hostPath:
@@ -326,6 +328,8 @@ data:
         hostPath:
           path: /tmp/github-runner-cache/test-runner-1/cache-0
           type: DirectoryOrCreate
+      - name: dummy-prepare-trigger
+        emptyDir: {}
 ---
 apiVersion: actions.github.com/v1alpha1
 kind: AutoscalingRunnerSet

pkg/templates/testdata/expected/privileged_multi_cache.yaml

@@ -297,6 +297,8 @@ data:
           mountPath: /var/lib/docker
         - name: cache-1
           mountPath: /nix/store
+        - name: dummy-prepare-trigger
+          mountPath: /tmp/dummy-prepare
       volumes:
       - name: sys
         hostPath:
@@ -332,6 +334,8 @@ data:
         hostPath:
           path: /nix/store
           type: DirectoryOrCreate
+      - name: dummy-prepare-trigger
+        emptyDir: {}
 ---
 apiVersion: actions.github.com/v1alpha1
 kind: AutoscalingRunnerSet

pkg/templates/testdata/expected/privileged_single_cache.yaml

@@ -295,6 +295,8 @@ data:
           mountPath: /lib/x86_64-linux-gnu
         - name: cache-0
           mountPath: /var/lib/docker
+        - name: dummy-prepare-trigger
+          mountPath: /tmp/dummy-prepare
       volumes:
       - name: sys
         hostPath:
@@ -326,6 +328,8 @@ data:
         hostPath:
           path: /var/lib/docker
           type: DirectoryOrCreate
+      - name: dummy-prepare-trigger
+        emptyDir: {}
 ---
 apiVersion: actions.github.com/v1alpha1
 kind: AutoscalingRunnerSet