Add old color feature for testing

src/color/devcontainer-feature.json

@@ -0,0 +1,21 @@
+{
+    "name": "My Favorite Color",
+    "id": "color",
+    "version": "1.0.3",
+    "description": "A feature to remind you of your favorite color",
+    "options": {
+        "favorite": {
+            "type": "string",
+            "enum": [
+                "red",
+                "gold",
+                "green"
+            ],
+            "default": "red",
+            "description": "Choose your favorite color."
+        }
+    },
+    "installsAfter": [
+        "ghcr.io/devcontainers/features/common-utils"
+    ]
+}

src/color/install.sh

@@ -0,0 +1,26 @@
+#!/bin/sh
+set -e
+
+echo "Activating feature 'color'"
+echo "The provided favorite color is: ${FAVORITE}"
+
+
+# The 'install.sh' entrypoint script is always executed as the root user.
+#
+# These following environment variables are passed in by the dev container CLI.
+# These may be useful in instances where the context of the final 
+# remoteUser or containerUser is useful.
+# For more details, see https://containers.dev/implementors/features#user-env-var
+echo "The effective dev container remoteUser is '$_REMOTE_USER'"
+echo "The effective dev container remoteUser's home directory is '$_REMOTE_USER_HOME'"
+
+echo "The effective dev container containerUser is '$_CONTAINER_USER'"
+echo "The effective dev container containerUser's home directory is '$_CONTAINER_USER_HOME'"
+
+cat > /usr/local/bin/color \
+<< EOF
+#!/bin/sh
+echo "my favorite color is ${FAVORITE}"
+EOF
+
+chmod +x /usr/local/bin/color