simplify ci setup a little

Author: samuelcolvin

.github/workflows/ci.yml

@@ -15,7 +15,7 @@ jobs:
       fail-fast: false
       matrix:
         rust-toolchain:
-          - nightly-2022-07-01
+          - nightly
         python-version:
           - '3.7'
           - '3.8'
@@ -34,8 +34,16 @@ jobs:
     steps:
     - uses: actions/checkout@v3
 
-    - name: install rust
-      uses: actions-rs/toolchain@v1.0.6
+    - name: install rust nightly
+      if: matrix.rust-toolchain == 'nightly'
+      uses: actions-rs/toolchain@v1
+      with:
+        # use the default version from rust-toolchain in case rust in pinned there
+        profile: minimal
+
+    - name: install rust stable
+      if: matrix.rust-toolchain != 'nightly'
+      uses: actions-rs/toolchain@v1
       with:
         profile: minimal
         toolchain: ${{ matrix.rust-toolchain }}
@@ -97,7 +105,7 @@ jobs:
     - uses: actions/checkout@v3
 
     - name: install rust
-      uses: actions-rs/toolchain@v1.0.6
+      uses: actions-rs/toolchain@v1
       with:
         profile: minimal
         override: true
@@ -140,7 +148,7 @@ jobs:
     - uses: actions/checkout@v3
 
     - name: install rust
-      uses: actions-rs/toolchain@v1.0.6
+      uses: actions-rs/toolchain@v1
       with:
         profile: minimal