Switch to shared workflows and linter fixes

.github/workflows/include.yml

@@ -0,0 +1,16 @@
+# Same as full workflow (eg from fortio/multicurl) but without the goreleaser step
+name: "Shared library fortio workflows"
+
+on:
+    push:
+      branches: [ main ]
+    pull_request:
+      branches: [ main ]
+
+jobs:
+    call-gochecks:
+        uses: fortio/workflows/.github/workflows/gochecks.yml@main
+    call-codecov:
+        uses: fortio/workflows/.github/workflows/codecov.yml@main
+    call-codeql:
+        uses: fortio/workflows/.github/workflows/codeql-analysis.yml@main

.gitignore

@@ -0,0 +1 @@
+.golangci.yml

Makefile

@@ -17,4 +17,12 @@ line:
 screenshot: line example
 	@echo
 
-.PHONY: all test example screenshot line
+
+lint: .golangci.yml
+	golangci-lint run
+
+.golangci.yml: Makefile
+	curl -fsS -o .golangci.yml https://raw.githubusercontent.com/fortio/workflows/main/golangci.yml
+
+
+.PHONY: all test example screenshot line lint