refactor(ci): use gofmt directly, mark shell scripts clearly

.github/workflows/ci.yaml

@@ -18,7 +18,7 @@ jobs:
       - uses: actions/setup-go@v4
         with:
           go-version: ${{ env.GO_VERSION }}
-      - run: . scripts/test
+      - run: . script/test.sh
   integration-tests:
     name: "Integration tests"
     runs-on: ubuntu-latest
@@ -29,4 +29,4 @@ jobs:
       - uses: actions/setup-go@v4
         with:
           go-version: ${{ env.GO_VERSION }}
-      - run: . integration/install_specific_version
+      - run: . integration/install_specific_version.sh

script/format.sh

@@ -0,0 +1,7 @@
+#!/usr/bin/bash
+
+if [[ -z "$FIX" ]]; then
+    [ -z "$(gofmt -s -l ./)" ] || exit 1
+else
+    gofmt -s -l -w ./
+fi

scripts/format

@@ -1,3 +0,0 @@
-#!/usr/bin/bash
-
-go fmt ./...