diff --git a/.github/actions/build-n-upload-action/entrypoint.sh b/.github/actions/build-n-upload-action/entrypoint.sh
index eb16380..ae98ffc 100755
--- a/.github/actions/build-n-upload-action/entrypoint.sh
+++ b/.github/actions/build-n-upload-action/entrypoint.sh
@@ -1,6 +1,8 @@
 #!/bin/sh -l
 
-echo "Hello $1"
+BUILD_TARGET=$1
+
+echo "build target: $BUILD_TARGET"
 time=$(date)
 echo "time=$time" >> $GITHUB_OUTPUT
 echo "pwd=$GITHUB_WORKSPACE" >> $GITHUB_OUTPUT
@@ -8,6 +10,7 @@ echo "pwd=$GITHUB_WORKSPACE" >> $GITHUB_OUTPUT
 cd $GITHUB_WORKSPACE
 
 nix flake show
+nix build .#$BUILD_TARGET
 
 # echo "ls=$(ls)" >> $GITHUB_OUTPUT
 # echo "status=$(git log)" >> $GITHUB_OUTPUT
diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index 407cc44..d9f86e2 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -27,15 +27,13 @@ jobs:
         uses: actions/checkout@v4
         with:
           ref: ${{ github.event.pull_request.head.sha || github.ref }}
-      - name: run git log
-        run: echo $PWD && git log -5
-      - name: Hello world action step
-        id: hello
+      - name: Build
+        id: build
         uses: ./.github/actions/build-n-upload-action
         with:
-          who-to-greet: 'Mona the Octocat'
+          build_target: 'fmo-os-installer-debug'
       # Use the output from the `hello` step
-      - name: Get the output time
+      - name: Upload Build Artifacts
         run: |
           echo "The time was ${{ steps.hello.outputs.time }}"
           echo "The pwd was ${{ steps.hello.outputs.pwd }}"