autodetect version in CI

Author: abe-winter

.github/workflows/build.yml

@@ -26,8 +26,7 @@ jobs:
     - uses: actions/checkout@v4
     - uses: viamrobotics/build-action@v1
       with:
-        # note: you can replace this line with 'version: ""' if you want to test the build process without deploying
-        version: "" # ${{ github.ref_name }}
+        version: ${{ startsWith(github.ref, 'refs/tags/v') && github.ref_name || '' }}
         ref: ${{ github.sha }}
         key-id: ${{ secrets.viam_key_id }}
         key-value: ${{ secrets.viam_key_value }}