Improve build speeds by caching

.github/workflows/ci.yaml

@@ -68,6 +68,24 @@ jobs:
         with:
           go-version-file: 'go.mod'
 
+      - name: Save Go cache paths
+        id: go-cache-paths
+        run: |
+          echo "::set-output name=go_mod_cache::$(go env GOMODCACHE)"
+          echo "::set-output name=go_cache::$(go env GOCACHE)"
+
+      - name: Create Go module cache
+        uses: actions/cache@v3
+        with:
+          path: ${{ steps.go-cache-paths.outputs.go_mod_cache }}
+          key: ${{ runner.os }}-go_mod_cache-${{ hashFiles('go.sum') }}
+
+      - name: Create Go cache
+        uses: actions/cache@v3
+        with:
+          path: ${{ steps.go-cache-paths.outputs.go_cache }}
+          key: ${{ runner.os }}-go_cache-${{ hashFiles('go.sum') }}
+
       - name: Verify module dependencies
         run: go mod verify