ci: use the build args from the dotenv file

.github/workflows/test-tools.yml

@@ -35,8 +35,12 @@ jobs:
       - name: Load .env file and set build-args
         id: load-env
         run: |
-          build_args=$(awk -F= '{print "--build-arg", $1"="$2}' .env | tr '\n' ' ')
-          echo "build_args=$build_args" >> $GITHUB_ENV
+          build_args=""
+          while read -r line; do
+            key=$(echo "$line" | cut -d '=' -f 1)
+            value=$(echo "$line" | cut -d '=' -f 2)
+            echo "$key=$value" >> build-args.txt
+          done < .env
 
       - name: Build container
         uses: docker/build-push-action@v6
@@ -46,7 +50,8 @@ jobs:
           cache-from: type=gha
           cache-to: type=gha,mode=max
           tags: theredguild/container-sec-tools:latest
-          build-args: ${{ env.build_args }}
+          build-args: |
+            $(cat build-args.txt)
 
       - name: Check disk space
         run: df -h