Fix the ability to specify a git directory

Makefile

@@ -11,7 +11,15 @@ DOCKER_PLATFORM=linux/amd64
 #To prevent the circular dependency, this repo calls the dockerBuild script directly
 #  instead of through the builder-docker image.
 docker:
-	./src/dockerBuild.sh dockerBuild -e ${DOCKER_REGISTRY} -r ${DOCKER_REPO} -p ${DOCKER_PLATFORM} -d "." -f ./docker/Dockerfile ${ARGS}
+	./src/dockerBuild.sh \
+        dockerBuild \
+        -e ${DOCKER_REGISTRY} \
+        -r ${DOCKER_REPO} \
+        -p ${DOCKER_PLATFORM} \
+        -d "." \
+        -g "." \
+        -f ./docker/Dockerfile \
+        ${ARGS}
 
 #Everything right of the pipe is order-only prerequisites.
 all: | docker

src/dockerBuild.sh

@@ -109,9 +109,9 @@ function dockerBuild
         exit 1
     fi
 
-    #If not git repo provided, default to current directory
+    #If not git repo provided, default to the code dir
     if [ -z "$GIT_DIR" ]; then
-        GIT_DIR="./.git"
+        GIT_DIR="$CODE_DIR/.git"
     fi
 
     #Default is to just tag with the git version.
@@ -127,7 +127,7 @@ function dockerBuild
 
     #Find the current git branch.
     local gitBranch=""
-    gitBranch=$(git branch --show-current)
+    gitBranch=$(git --git-dir "$GIT_DIR" branch --show-current)
     if [ -z "$gitBranch" ]; then
         echo "Could not determine git branch name, caching to main."
         gitBranch="$MAIN_BRANCH"