add "lint" to Justfile

Justfile

@@ -10,3 +10,17 @@ dev:
 
 build:
     CGO_ENABLED=0 go build -ldflags '-s -w' -v -o build/codeberg-pages-server ./
+
+lint: tool-golangci tool-gofumpt
+    [ $(gofumpt -extra -l . | wc -l) != 0 ] && { echo 'code not formated'; exit 1; }; \
+    golangci-lint run
+
+tool-golangci:
+    @hash golangci-lint> /dev/null 2>&1; if [ $? -ne 0 ]; then \
+    ggo install github.com/golangci/golangci-lint/cmd/golangci-lint@latest; \
+    fi
+
+tool-gofumpt:
+    @hash gofumpt> /dev/null 2>&1; if [ $? -ne 0 ]; then \
+    go install mvdan.cc/gofumpt@latest; \
+    fi