.

.devcontainer/devcontainer.json

@@ -29,7 +29,8 @@
   //   //, "ghcr.io/devcontainers-contrib/features/scalacli-sdkman:2": {}
   },
 
-  "onCreateCommand": "mill -j 0 __.prepareOffline && mill -j 0 __.compile && mill mill.bsp.BSP/install"
+  // Try do do as much as possible in the image, so that the container starts up quickly
+  "onCreateCommand": "mill -j 0 __.prepareOffline && mill -j 0 __.compile && mill mill.bsp.BSP/install && mill --import ivy:com.lihaoyi::mill-contrib-bloop:  mill.contrib.bloop.Bloop/install"
 
   // // Use 'forwardPorts' to make a list of ports inside the container available locally.
   // "forwardPorts": [],

.devcontainer/features/mill/devcontainer-feature.json

@@ -1,8 +1,8 @@
 {
   "id": "mill",
   "version": "1.0.0",
-  "name": "Mill Build Tool",
-  "description": "Installs Mill, a Scala build tool.",
+  "name": "Mill, Coursier, Metals",
+  "description": "Some OSS scala utils",
   "installsAfter":  [
     "ghcr.io/devcontainers/features/java:1"
   ],

.devcontainer/features/mill/install.sh

@@ -2,6 +2,11 @@
 
 set -e
 
-# Install Mill
+# Put millw on the path, so we can call 'mill' from the command line.
 curl -L -o /usr/local/bin/mill https://raw.githubusercontent.com/lefou/millw/0.4.11/millw && chmod +x /usr/local/bin/mill
-curl -fL "https://github.com/coursier/launchers/raw/master/cs-x86_64-pc-linux.gz" | gzip -d > /usr/local/bin/cs && chmod +x /usr/local/bin/cs
+
+# Install Coursier - can call cs from command line
+curl -fL "https://github.com/coursier/launchers/raw/master/cs-x86_64-pc-linux.gz" | gzip -d > /usr/local/bin/cs && chmod +x /usr/local/bin/cs
+
+# Install metals - should prevent dependancy downloads on container start
+cs install metals

.github/workflows/container.yml

@@ -36,5 +36,6 @@ jobs:
           # Change this to be your CI task/script
           runCmd: |
             # Add multiple commands to run if needed
-            ./mill -v
-            ./mill __.compile
+            cs version
+            mill -v
+            mill __.compile