Pin Ubunut version

.github/workflows/build.yml

@@ -10,7 +10,7 @@ on:
 
 jobs:
   lint:
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-20.04
     steps:
       - uses: actions/checkout@v3
       - name: Setup Node.js
@@ -40,12 +40,12 @@ jobs:
         # Build for supported platforms
         # https://github.com/electron/electron-packager/blob/ebcbd439ff3e0f6f92fa880ff28a8670a9bcf2ab/src/targets.js#L9
         # 32-bit Linux unsupported as of 2019: https://www.electronjs.org/blog/linux-32bit-support
-        os: [ macOS-latest, ubuntu-latest, windows-latest ]
+        os: [ macOS-latest, ubuntu-20.04, windows-latest ]
         arch: [ x64, arm64 ]
         include:
         - os: windows-latest
           arch: ia32
-        - os: ubuntu-latest
+        - os: ubuntu-20.04
           arch: armv7l
         # Publishing artifacts for multiple Windows architectures has
         # a bug which can cause the wrong architecture to be downloaded