shellcheck: fix issues

Signed-off-by: Patrick Williams <patrick@stwcx.xyz>
Change-Id: I8d2f299a29a4fd8cf97ea238a982c15bae549207
diff --git a/.shellcheckrc b/.shellcheckrc
new file mode 100644
index 0000000..ecc9040
--- /dev/null
+++ b/.shellcheckrc
@@ -0,0 +1,3 @@
+enable=all
+source-path=SCRIPTDIR
+disable=SC2154