feat: update Makefile, renovate, gitlangci-lint, markdownlint, container-image

.gitattributes

@@ -0,0 +1,10 @@
+# checkout alls text files with end of line = line feed
+* text eol=lf
+
+# Binary files should be checked in and out as binary
+*.png binary
+*.jpg binary
+*.eot binary
+*.ttf binary
+*.pkcs8 binary
+*.pkcs12 binary