update image

.devcontainer/devcontainer.json

 {
-    "name": "Substrate Node template",
-    "dockerFile": "Dockerfile",
-    "settings": {
-      "terminal.integrated.shell.linux": "/bin/bash",
-      "lldb.executable": "/usr/bin/lldb"
-    },
-    "extensions": [
-      "rust-lang.rust",
-      "bungcip.better-toml",
-      "vadimcn.vscode-lldb"
-    ],
-    "forwardPorts": [
-      3000,
-      9944
-    ]
-  }
-  
\ No newline at end of file
+  "name": "Substrate Node template",
+  "dockerFile": "Dockerfile",
+  "settings": {
+    "terminal.integrated.shell.linux": "/bin/bash",
+    "lldb.executable": "/usr/bin/lldb"
+  },
+  "extensions": [
+    "rust-lang.rust",
+    "bungcip.better-toml",
+    "vadimcn.vscode-lldb"
+  ],
+  "forwardPorts": [
+    3000,
+    9944
+  ],
+  "image": "jeluard/substrate-playground-template-node-template:sha-64ca567"
+}