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.devcontainer/devcontainer.json

@@ -12,7 +12,7 @@
     "mounts": [
       "type=bind,source=${localEnv:HOME}${localEnv:USERPROFILE}/.ssh/,target=/home/vscode/.ssh,readonly"
     ],
-    "postAttachCommand": "sh .devcontainer/startup.sh",
+    "postStartCommand": "sh .devcontainer/startup.sh",
     "features": {
         "ghcr.io/devcontainers-extra/features/typescript:2": {}
     },
@@ -30,8 +30,8 @@
                 "amodio.tsl-problem-matcher"
             ]
         }
-    },
-    "postCreateCommand": "sh .devcontainer/startup.sh",
+    }
+//    "postCreateCommand": "sh .devcontainer/startup.sh"
     // Use 'forwardPorts' to make a list of ports inside the container available locally.
     // "forwardPorts": [],
     // Use 'postCreateCommand' to run commands after the container is created.

.devcontainer/startup.sh

@@ -5,4 +5,8 @@ npm install --global npm@latest
 npm install --global @vscode/vsce
 npm install --global typescript
 npm install @types/node
-npm i --global esbuild
+npm i --global esbuild
+
+# Clear the screen and print welcome text:
+clear 
+cat .devcontainer/welcome.txt  # /usr/local/etc/vscode-dev-containers/first-run-notice.txt

.devcontainer/welcome.txt

@@ -0,0 +1,10 @@
+👋 Welcome to the developer environment for the Ampersand-Language-Support 
+   extention! This environment should help you with the development of the 
+   is repo. 
+
+🛠️  Your environment is fully setup with all the required software.
+    If you think something is missing, please ask @Hanjoosten.
+
+👉 IMPORTANT: Before pushing to master, make sure the project has been compiled, so 
+    there are no extra changes in `package.json` and/or `package-lock.json`
+