chore: add formatting check to gh actions

Author: SerhiiCho

.github/workflows/test.yml

@@ -22,5 +22,8 @@ jobs:
         with:
           go-version: 1.23
 
+      - name: Check formatting
+        run: make check-fmt
+
       - name: Test
         run: make

Makefile

@@ -8,4 +8,13 @@ test:
 build:
 	go build main.go
 
+.PHONE: check-fmt
+check-fmt:
+	unformatted=$$(gofmt -l .); \
+	if [ -n "$$unformatted" ]; then \
+		echo "The following files are not formatted properly:"; \
+		echo "$$unformatted"; \
+		exit 1; \
+	fi
+
 .DEFAULT_GOAL := test