ci: Add a timeout for all jobs

Author: tgross35

.github/workflows/main.yaml

@@ -14,6 +14,7 @@ jobs:
   test:
     name: Test
     runs-on: ${{ matrix.os }}
+    timeout-minutes: 20
     strategy:
       matrix:
         build: [stable, beta, nightly]
@@ -37,6 +38,7 @@ jobs:
   rustfmt:
     name: Rustfmt
     runs-on: ubuntu-latest
+    timeout-minutes: 10
     steps:
     - uses: actions/checkout@v3
     - name: Install Rust