run apt-get update for GH linux

Author: binji

.github/workflows/build.yml

@@ -24,7 +24,9 @@ jobs:
         submodules: true
 
     - name: install packages (linux)
-      run: sudo apt-get install ninja-build libsdl2-dev
+      run: |
+        sudo apt-get update
+        sudo apt-get install ninja-build libsdl2-dev
       if: matrix.os == 'ubuntu-latest'
 
     - name: install packages (macos)

.github/workflows/build_release.yml

@@ -24,7 +24,9 @@ jobs:
         submodules: true
 
     - name: install packages (linux)
-      run: sudo apt-get install ninja-build libsdl2-dev
+      run: |
+        sudo apt-get update
+        sudo apt-get install ninja-build libsdl2-dev
       if: matrix.os == 'ubuntu-latest'
 
     - name: install packages (macos)