feat: Add local devcontainer configuration with npm, docker, git-lfs

Author: wdconinc

.devcontainer/devcontainer.json

@@ -0,0 +1,18 @@
+{
+    "name": "CVMFS Action Dev",
+    "image": "mcr.microsoft.com/devcontainers/base:ubuntu",
+    "features": {
+        "ghcr.io/devcontainers/features/node": {},
+        "ghcr.io/devcontainers/features/docker-in-docker": {},
+        "ghcr.io/devcontainers/features/git-lfs": {}
+    },
+    "forwardPorts": [],
+    "postCreateCommand": "npm install -g @devcontainers/cli",
+    "customizations": {
+        "vscode": {
+            "extensions": [
+                "GitHub.vscode-github-actions"
+            ]
+        }
+    }
+}