ci: add support for linux-arm64 AppImage and deb

Update electron-builder to be able to disable rebuilds, everything is prebuild anyway.
As part of electron-builder upgrade, fix sign and notarize on pull
requests for mac and continue to notarize outside of builder, because notarize within electron-builder
required teamId to be set in build config, but we want to keep that in env for now

See https://github.com/electron-userland/electron-builder/blob/master/packages/app-builder-lib/src/macPackager.ts#L525

.github/workflows/ci.yml

@@ -32,7 +32,10 @@ jobs:
         path: |
           dist/jitsi-meet-amd64.deb
           dist/jitsi-meet-x86_64.AppImage
+          dist/jitsi-meet-arm64.deb
+          dist/jitsi-meet-arm64.AppImage
           dist/latest-linux.yml
+          dist/latest-linux-arm64.yml
   build-mac:
     name: macOS
     runs-on: macos-11
@@ -48,6 +51,7 @@ jobs:
       run: |
         echo "CSC_LINK=${{ secrets.mac_cert }}" >> $GITHUB_ENV
         echo "CSC_KEY_PASSWORD=${{ secrets.mac_cert_password }}" >> $GITHUB_ENV
+        echo "CSC_FOR_PULL_REQUEST=true" >> $GITHUB_ENV
         echo "APPLE_ID=${{ secrets.apple_id }}" >> $GITHUB_ENV
         echo "APPLE_ID_PASSWORD=${{ secrets.apple_id_password }}" >> $GITHUB_ENV
         echo "TEAM_ID=${{ secrets.team_id }}" >> $GITHUB_ENV

README.md

@@ -20,7 +20,7 @@ Download our latest release and you're off to the races!
 
 | Windows | macOS | GNU/Linux (AppImage) | GNU/Linux (Deb) |
 | -- | -- | -- | -- |
-| [Download](https://github.com/jitsi/jitsi-meet-electron/releases/latest/download/jitsi-meet.exe) | [Download](https://github.com/jitsi/jitsi-meet-electron/releases/latest/download/jitsi-meet.dmg) | [Download](https://github.com/jitsi/jitsi-meet-electron/releases/latest/download/jitsi-meet-x86_64.AppImage) | [Download](https://github.com/jitsi/jitsi-meet-electron/releases/latest/download/jitsi-meet-amd64.deb) |
+| [Download](https://github.com/jitsi/jitsi-meet-electron/releases/latest/download/jitsi-meet.exe) | [Download](https://github.com/jitsi/jitsi-meet-electron/releases/latest/download/jitsi-meet.dmg) | [x64_64](https://github.com/jitsi/jitsi-meet-electron/releases/latest/download/jitsi-meet-x86_64.AppImage) [arm64](https://github.com/jitsi/jitsi-meet-electron/releases/latest/download/jitsi-meet-arm64.AppImage) | [x86_64](https://github.com/jitsi/jitsi-meet-electron/releases/latest/download/jitsi-meet-amd64.deb) [arm64](https://github.com/jitsi/jitsi-meet-electron/releases/latest/download/jitsi-meet-arm64.deb) |
 
 NOTE: The GNU/Linux builds are 64-bit only.