generate GitHub annotations for build checks

Signed-off-by: CrazyMax <1951866+crazy-max@users.noreply.github.com>

test/lint.hcl

@@ -0,0 +1,12 @@
+group "default" {
+  targets = ["lint", "lint-other", "lint-inline"]
+}
+target "lint" {
+  dockerfile = "lint.Dockerfile"
+}
+target "lint-other" {
+  dockerfile = "lint-other.Dockerfile"
+}
+target "lint-inline" {
+  dockerfile-inline = "FRoM alpine\nENTRYPOINT [\"echo\", \"hello\"]"
+}