mk: add lint target

Run go vet only for now. More linters can be added later. Run linters in
the CI pipeline.

Signed-off-by: Moritz Poldrack <git@moritz.sh>
Acked-by: Robin Jarry <robin@jarry.cc>

.builds/alpine-edge.yml

@@ -14,6 +14,9 @@ tasks:
   - checkfmt: |
       cd aerc
       make checkfmt
+  - lint: |
+      cd aerc
+      make lint
   - build: |
       cd aerc
       make

Makefile

@@ -64,6 +64,10 @@ checkfmt:
 		exit 1; \
 	fi
 
+.PHONY: lint
+lint:
+	$(GO) vet ./...
+
 .PHONY: tests
 tests:
 	$(GO) test $(GOFLAGS) -v ./...