Add nightly channel to build

Author: ProphetLamb

.github/workflows/build.yml

@@ -18,6 +18,7 @@ jobs:
       matrix:
         dotnet:
           [{ ch: "3.1", ver: "netcoreapp31" }, { ch: "6.0", ver: "net60" }]
+        nightly: [true, false]
 
     steps:
       - name: Checkout
@@ -36,6 +37,7 @@ jobs:
         run: |
           mkdir -p ~/.local/bin
           export INSTALL_DIR=~/.local/bin
+          export NIGHTLY=${{ matrix.nightly }}
           curl -sSf https://install.surrealdb.com | sh
           export PATH="$HOME/.local/bin/:$PATH"