add linters go vet and staticcheck

fix #6

Signed-off-by: Sandor Szücs <[email protected]>

dockertest.sh

@@ -2,8 +2,17 @@
 
 set -ev
 
+go vet ./...
+
+go install honnef.co/go/tools/cmd/staticcheck@latest
+# disabled checks
+#  -ST1000 missing package doc in internal packages
+#  -ST1003 wrong naming convention would require breaking changes
+staticcheck -checks "all,-ST1000,-ST1003"  ./... | (grep -v "_test.go:" && exit 1 || exit 0)
+
 trap "docker-compose down -v" EXIT
 docker-compose up -d
 sleep 5
+
 go install gotest.tools/[email protected]
 gotestsum --format standard-verbose --junitfile unit-tests.xml -- -coverprofile=coverage.out -race -timeout 30m "$@"