fix(macos): correctly clean up keychain (#1075)

.github/workflows/macos.yml

@@ -80,7 +80,7 @@ jobs:
             cd "VSCode-darwin-${VSCODE_ARCH}"
             export CERTIFICATE_P12=VSCodium.p12
             echo $CERTIFICATE_OSX_P12 | base64 --decode > $CERTIFICATE_P12
-            export KEYCHAIN=build.keychain
+            export KEYCHAIN=$RUNNER_TEMP/build.keychain
             security create-keychain -p mysecretpassword $KEYCHAIN
             security default-keychain -s $KEYCHAIN
             security unlock-keychain -p mysecretpassword $KEYCHAIN
@@ -107,6 +107,11 @@ jobs:
           GITHUB_USERNAME: ${{ github.repository_owner }}
 
       - name: Clean up keychain
-        if: ${{ always() }}
+        if: always()
         run: |
-          security delete-keychain build.keychain
+          KEYCHAIN=$RUNNER_TEMP/build.keychain
+
+          if [ -f "$KEYCHAIN" ];
+          then
+            security delete-keychain $KEYCHAIN
+          fi