Add api lint to upload checks

Currently will never block upload, only considered a warning, but
will print out any lint issues discovered.

Test: do an upload
Bug: 69115822
Change-Id: I69b8e5a3f92ac28ee3c954408e88a1056c33af65
diff --git a/tools/apilint/apilint_sha.sh b/tools/apilint/apilint_sha.sh
new file mode 100755
index 0000000..2a45b10
--- /dev/null
+++ b/tools/apilint/apilint_sha.sh
@@ -0,0 +1,4 @@
+#!/bin/bash
+if git show --name-only --pretty=format: $1 | grep api/ > /dev/null; then
+    python tools/apilint/apilint.py <(git show $1:api/current.txt) <(git show $1^:api/current.txt)
+fi