Add a script to check baserom before building

check_baserom.sh

@@ -0,0 +1,22 @@
+#!/bin/bash
+
+# Check if the baserom.gba file exists
+if [ ! -f baserom.gba ]; then
+    echo "baserom.gba not found!"
+    exit 1
+fi
+
+# Define the expected SHA-1 value
+expected_sha1="A57095DA867DE4D585C33D4394712986245FE6CA"
+
+# Calculate the SHA-1 of the file (use shasum because sha1sum is not available on macOS)
+actual_sha1=$(shasum baserom.gba | awk '{print $1}')
+
+# Compare the calculated SHA-1 with the expected value
+if [ "${actual_sha1,,}" = "${expected_sha1,,}" ]; then
+    echo "SHA-1 matches!"
+    exit 0
+else
+    echo "SHA-1 does not match!"
+    exit 2
+fi