ci: improve visual snapshot workflow setup time

.github/workflows/update visual snapshots.yml

@@ -37,12 +37,23 @@ jobs:
           npm install
           luarocks install --lua-version=5.1 busted
 
-      # Very slow (3mins) - can probably be made faster using http://github.com/microsoft/playwright/issues/23388
-      - name: Install Playwright Browsers
-        run: npx playwright install --with-deps
+      - name: Compile stylesheets
+        run: npm run build:css
+
+      - name: Generate HTML from Lua
+        id: generate-lua
+        env:
+          UPDATE_SNAPSHOTS: true
+          GITHUB_CI: true
+        run: |
+          echo 'GENERATED_ARGS<<EOF' >> "$GITHUB_ENV"
+          busted -C lua
+          echo EOF >> "$GITHUB_ENV"
 
       - name: Update snapshots
-        run: UPDATE_SNAPSHOTS=true npm run lua-test
+        uses: docker://mcr.microsoft.com/playwright:v1.55.0-noble
+        with:
+          args: ${{ steps.generate-lua.outputs.GENERATED_ARGS }}
 
       - name: Commit and push if snapshots changed
         uses: stefanzweifel/git-auto-commit-action@v6

lua/spec/helpers/test_helper.lua

@@ -103,6 +103,12 @@ return function(busted, helper, options)
 		file:close()
 	end
 
+	local function appendFile(fileName, data)
+		local file = assert(io.open(fileName, 'a+'))
+		file:write(data)
+		file:close()
+	end
+
 	local function GoldenTest(testName, actual)
 		-- Currently we're only running snapshots tests while updating them too
 		if os.getenv('UPDATE_SNAPSHOTS') ~= 'true' then
@@ -129,6 +135,11 @@ return function(busted, helper, options)
 			nodeJsCommand = nodeJsCommand .. ' --update-snapshots'
 		end
 
+		if os.getenv('GITHUB_CI') == 'true' then
+			appendFile(os.getenv('GITHUB_ENV'), nodeJsCommand .. '\n')
+			return
+		end
+
 		local exitCode = os.execute(nodeJsCommand)
 		os.remove(finalHtmlPath)