workflows: Try to avoid possible artifact upload race

Sometimes upload of one of the Windows/macOS installers fail.
This may be caused by a race condition if we try to upload at the same
time the same artifact for 2 different Windows version.
This commit tries to append the name of the OS to the artifact name to
avoid this race.

Author: cfergeau

.github/workflows/macos-installer.yml

@@ -50,5 +50,5 @@ jobs:
       - name: Upload macOS installer artifact
         uses: actions/upload-artifact@v2
         with:
-          name: macOS Installer
+          name: macOS Installer (${{ matrix.os }})
           path: "./out/macos-amd64/crc-macos-amd64.pkg"

.github/workflows/windows-installer.yml

@@ -31,5 +31,5 @@ jobs:
       - name: Upload windows installer artifact
         uses: actions/upload-artifact@v2
         with:
-          name: Windows Installer
+          name: Windows Installer (${{ matrix.os }})
           path: "./out/windows-amd64/crc-windows-installer.zip"