GitHub: cache linter

Author: guggero

.github/workflows/main.yml

@@ -28,6 +28,18 @@ jobs:
         with:
           fetch-depth: 0
 
+      - name: linter cache
+        uses: actions/cache@v4
+        with:
+          path: |
+            /tmp/go-lint-cache
+          key: ${{ runner.os }}-go-${{ env.GO_VERSION }}-linter-${{ hashFiles('**/go.sum') }}
+
+      - name: Cache Docker images.
+        uses: ScribeMD/[email protected]
+        with:
+          key: docker-${{ runner.os }}-${{ hashFiles('**/go.sum') }}
+
       - name: lint
         run: make lint