tests: complete exec tests (for now)

Signed-off-by: Amneesh Singh <natto@weirdnatto.in>

.github/workflows/main.yml

@@ -14,6 +14,11 @@ jobs:
           extra_nix_config: |
             auto-optimise-store = true
             experimental-features = nix-command flakes
+      - uses: cachix/cachix-action@v12
+        with:
+          name: pain
+          authToken: '${{ secrets.CACHIX_AUTH_TOKEN }}'
+
 
       - name: setup
         run: nix develop -c meson setup $BUILDDIR