Small fixes in ci.yml

- Add `profile: minimal`
- Install `rustfmt` when installing the toolchain, not afterwards
- Use stable toolchain for `rustfmt`
- Replace `override` with `default`. I think this better reflects the
  "use what we just installed" intent.

.github/workflows/ci.yml

@@ -9,7 +9,6 @@ on:
 name: CI
 
 jobs:
-
   test:
     name: run tests
     strategy:
@@ -22,7 +21,8 @@ jobs:
       - uses: actions-rs/toolchain@v1
         with:
           toolchain: ${{ matrix.rust }}
-          override: true
+          profile: minimal
+          default: true
       - name: Build with default features
         uses: actions-rs/cargo@v1
         with:
@@ -45,8 +45,9 @@ jobs:
       - uses: actions-rs/toolchain@v1
         with:
           toolchain: stable
+          profile: minimal
+          default: true
           components: clippy
-          override: true
       - uses: actions-rs/clippy-check@v1
         with:
           token: ${{ secrets.GITHUB_TOKEN }}
@@ -59,9 +60,10 @@ jobs:
     - uses: actions/checkout@v2
     - uses: actions-rs/toolchain@v1
       with:
-        toolchain: '1.60'
-        override: true
-    - run: rustup component add rustfmt
+        toolchain: stable
+        profile: minimal
+        default: true
+        components: rustfmt
     - uses: actions-rs/cargo@v1
       with:
         command: fmt
@@ -79,7 +81,8 @@ jobs:
       - uses: actions-rs/toolchain@v1
         with:
           toolchain: stable
-          override: true
+          profile: minimal
+          default: true
       - name: Build
         uses: actions-rs/cargo@v1
         with: