Bring back devcontainer apt-get feature

Author: erikw

.devcontainer/Dockerfile

@@ -1,13 +1,17 @@
 {
-	"build": {
-        "dockerfile": "Dockerfile"
-      },
-	// "features": {
-		// "ghcr.io/devcontainers-extra/features/apt-get-packages:1": {
-		// // NOTE moved to Dockerfile to utilize docker build cache. But it's actually unclear if this will be faster than the apt-get-packages feature, as it might also utilize overlay filesystem.
-		// 	"packages": ["octave", "z3", "multitime"] // Keep in sync with Brewfile, apt-packages.txt
-		// }
-	// },
+	"features": {
+		"ghcr.io/devcontainers-extra/features/apt-get-packages:1": {
+			// Keep in sync with Brewfile, apt-packages.txt
+			"packages": [
+				"cloc",
+				"direnv",
+				"multitime",
+				"octave",
+				"shellcheck",
+				"z3",
+			]
+		}
+	},
 	"postCreateCommand": "bash scripts/devcontainer_postCreateCommand.sh",
 	"customizations": {
 		"vscode": {
@@ -19,4 +23,4 @@
 			]
 		}
 	}
-}
+}