Enhancement (ci): Rename build state artifact to .build.state (star…

…tersclan#117)

The build state file being an artifact is better named as a hidden file. That way, the file can more easily be ignored in dev environments with `.gitignore` and run less risk of being accidentally committed.

build.sh

@@ -215,17 +215,17 @@ if [ ! "$NO_PUSH" = 'true' ]; then
     docker logout
 fi
 
-# Create build.state artifact
-echo "Creating build.state artifact"
+# Create .build.state artifact
+echo "Creating .build.state artifact"
 # Searching for 'WORKDIR /server' is a reliable way to locate the base image layers
 BASE_SIZE=0; for i in $( docker history "$REPOSITORY:latest" --format='{{.Size}} {{.CreatedAt}} {{.CreatedBy}}' --no-trunc --human=false | grep 'WORKDIR /server' -A99999 | awk '{print $1}' ); do BASE_SIZE=$(( $BASE_SIZE + $i )); done
 # Searching for 'UPDATE' is a reliable way to determine the incremental image layers
 LAYERS_SIZE=0; for i in $( docker history "$REPOSITORY:latest" --format='{{.Size}} {{.CreatedAt}} {{.CreatedBy}}' --no-trunc --human=false | grep UPDATE | awk '{print $1}' ); do LAYERS_SIZE=$(( $LAYERS_SIZE + $i )); done
 LAYERED_SIZE=$(( $BASE_SIZE + $LAYERS_SIZE ))
-cat - > build.state <<EOF
+cat - > .build.state <<EOF
 BASE_SIZE=$BASE_SIZE
 LAYERED_SIZE=$LAYERED_SIZE
 DIFF=$LAYERS_SIZE
 EOF
-cat build.state
-ls -al build.state
+cat .build.state
+ls -al .build.state