Add makefile and update protoc version

Use makefile and installation script for protoc.
Update protoc version to match containerd.

Signed-off-by: Derek McGowan <derek@mcg.dev>

.gitignore

@@ -1,4 +1,5 @@
 # Binaries for programs and plugins
+/bin/
 *.exe
 *.dll
 *.so
@@ -9,3 +10,4 @@
 
 # Output of the go coverage tool, specifically when used with LiteIDE
 *.out
+coverage.txt