ci: better Go modules cache (#206)

.github/workflows/static.yml

@@ -67,6 +67,9 @@ jobs:
       - uses: actions/setup-go@v4
         with:
           go-version: '1.21'
+          cache-dependency-path: |
+            go.sum 
+            caddy/go.sum   
 
       - name: Install static-php-cli dependencies
         working-directory: static-php-cli/

.github/workflows/tests.yml

@@ -12,6 +12,9 @@ jobs:
       - uses: actions/setup-go@v4
         with:
           go-version: '1.21'
+          cache-dependency-path: |
+            go.sum 
+            caddy/go.sum
 
       - uses: shivammathur/setup-php@v2
         with: