Fetch missing packages.

Author: jdm

.github/workflows/main.yml

@@ -19,7 +19,9 @@ jobs:
           profile: minimal
 
       - name: Install packages
-        run: sudo apt-get install -y libegl1-mesa-dev libgtk-3-dev libsdl2-dev cmake
+        run: |
+          sudo apt-get update
+          sudo apt-get install -y libegl1-mesa-dev libgtk-3-dev libsdl2-dev cmake
         
       - name: Install rustc target
         run: rustup target add aarch64-unknown-linux-gnu