remove schedule nightly job

Author: GregHanson

.github/workflows/test_build.yml

@@ -1,8 +1,6 @@
 name: Building JSON2RDF and testing
 
 on: 
-  schedule:
-    - cron: '0 0 * * SAT'
   push:
 
 env:
@@ -16,7 +14,7 @@ jobs:
 
     - uses: actions-rust-lang/setup-rust-toolchain@v1
       with:
-        toolchain: ${{ github.event.schedule == '' && 'stable' || 'nightly' }}
+        toolchain: stable
         cache: false
 
     - name: Build
@@ -29,7 +27,7 @@ jobs:
     - uses: actions/checkout@v4
     - uses: actions-rust-lang/setup-rust-toolchain@v1
       with:
-        toolchain: ${{ github.event.schedule == '' && 'stable' || 'nightly' }}
+        toolchain: stable
         cache: false
 
     - name: Run Rust integration tests