ci: Run apt-get update when installing system packages.

Author: waywardmonkeys

.github/workflows/main.yml

@@ -24,7 +24,8 @@ jobs:
       - uses: actions/checkout@v3
 
       - name: Install packages
-        run: sudo apt-get install -y binutils-dev libunwind8-dev libcurl4-openssl-dev libelf-dev libdw-dev cmake gcc libiberty-dev
+        if: matrix.os == 'ubuntu-latest'
+        run: sudo apt-get update -y && sudo apt-get install -y binutils-dev libunwind8-dev libcurl4-openssl-dev libelf-dev libdw-dev cmake gcc libiberty-dev
 
       - name: Install toolchain
         uses: dtolnay/rust-toolchain@master