debugging CI build

Author: mikeshulman

.github/workflows/build.yml

@@ -18,8 +18,9 @@ jobs:
     - uses: actions/checkout@v4
     - uses: DeterminateSystems/nix-installer-action@main
     - run: nix profile install nixpkgs#cachix
-    - run: echo "GIT_COMMIT=$GITHUB_SHA" >> $GITHUB_ENV
-    - run: nix build --impure --accept-flake-config .
+    - run: echo "GITHUB_SHA is $GITHUB_SHA"
+    - run: echo "GIT_COMMIT=build-$GITHUB_SHA" >> $GITHUB_ENV
+    - run: nix build --impure --option substituters "" --accept-flake-config .
     - run: cd dist && ./build.sh
     - name: Upload static files as artifact
       id: deployment