save script to automate flashing commands

hello_gradient/flash.sh

@@ -0,0 +1,20 @@
+#!/bin/sh
+
+set -e
+
+APPLET=$1
+TARGET_BIN="target/thumbv6m-none-eabi/release/$APPLET"
+test -e "$TARGET_BIN" || {
+    echo "'$APPLET' does not exist"
+    exit 1
+}
+
+arm-none-eabi-objcopy -O binary "$TARGET_BIN" flash.bin
+uf2conv-rs flash.bin -o flash.uf2
+
+sudo mount LABEL=ITSYBOOT mnt/
+echo "Flashing..."
+sudo cp flash.uf2 mnt/flash.uf2
+sync
+echo "Done."
+sudo umount mnt/