fix: use xz compression when building deb package (#230471)

build/azure-pipelines/linux/product-build-linux.yml

@@ -305,6 +305,11 @@ steps:
     - script:  |
         set -e
         npm run gulp "vscode-linux-$(VSCODE_ARCH)-build-deb"
+        file_output=$(file $(ls .build/linux/deb/*/deb/*.deb))
+        if [[ "$file_output" != *"data compression xz"* ]]; then
+          echo "Error: unknown compression. $file_output"
+          exit 1
+        fi
         echo "##vso[task.setvariable variable=DEB_PATH]$(ls .build/linux/deb/*/deb/*.deb)"
       displayName: Build deb package
 

build/gulpfile.vscode.linux.js

@@ -128,7 +128,7 @@ function buildDebPackage(arch) {
 	return async () => {
 		await exec(`chmod 755 ${product.applicationName}-${debArch}/DEBIAN/postinst ${product.applicationName}-${debArch}/DEBIAN/prerm ${product.applicationName}-${debArch}/DEBIAN/postrm`, { cwd });
 		await exec('mkdir -p deb', { cwd });
-		await exec(`fakeroot dpkg-deb -b ${product.applicationName}-${debArch} deb`, { cwd });
+		await exec(`fakeroot dpkg-deb -Zxz -b ${product.applicationName}-${debArch} deb`, { cwd });
 	};
 }