Fix local builds

makefile doesn't like the script returning the macro, directed to null for local builds as version.dtsi file accessible

Makefile

@@ -13,7 +13,7 @@ endif
 .PHONY: all clean
 
 all:
-	$(shell bin/get_version.sh)
+	$(shell bin/get_version.sh >> /dev/null)
 	$(DOCKER) build --tag zmk --file Dockerfile .
 	$(DOCKER) run --rm -it --name zmk \
 		-v $(PWD)/firmware:/app/firmware$(SELINUX1) \

bin/get_version.sh

@@ -2,8 +2,8 @@
 
 # Get the date, first 4 chars of branch name and short commit hash
 date=$(date -u +"%Y%m%d")
-branch=${1:-(git rev-parse --abbrev-ref HEAD | cut -c1-4)}
-commit=${2:-(git rev-parse --short HEAD)}
+branch=${1:-$(git rev-parse --abbrev-ref HEAD | cut -c1-4)}
+commit=${2:-$(git rev-parse --short HEAD)}
 
 # Function to transform characters to ZMK key behaviours
 transform_char() {