[chore] Better diff for envparsing test (#1562)

This checks if jd is availalbe and if so uses that to create the diff
instead. jd can tell you at which (nested) key the values are differing
which makes for more human friendly output.

test/envparsing.sh

@@ -94,7 +94,12 @@ echo "$OUTPUT" > "$OUTPUT_OUT"
 EXPECT_OUT=$(mktemp)
 echo "$EXPECT" > "$EXPECT_OUT"
 
-if ! DIFF=$(diff "$OUTPUT_OUT" "$EXPECT_OUT"); then
+DIFFCMD=$(command -v diff 2>&1)
+if command -v jd >/dev/null 2>&1; then
+    DIFFCMD=$(command -v jd 2>&1)
+fi
+
+if ! DIFF=$("$DIFFCMD" "$OUTPUT_OUT" "$EXPECT_OUT"); then
     echo "OUTPUT not equal EXPECTED"
     echo "$DIFF"
     exit 1