more CI yml cleanup

src/tools/miri/.github/workflows/ci.yml

@@ -11,11 +11,14 @@ on:
       - 'master'
   schedule:
     - cron: '6 6 * * *' # At 6:06 UTC every day.
-    - cron: '22 * * * *' # Also each hour, for testing
 
 env:
   CARGO_UNSTABLE_SPARSE_REGISTRY: 'true'
 
+defaults:
+  run:
+    shell: bash
+
 jobs:
   build:
     runs-on: ${{ matrix.os }}
@@ -60,12 +63,9 @@ jobs:
 
       - name: Install rustup-toolchain-install-master
         if: ${{ steps.cache.outputs.cache-hit != 'true' }}
-        shell: bash
-        run: |
-          cargo install -f rustup-toolchain-install-master
+        run: cargo install -f rustup-toolchain-install-master
 
       - name: Install "master" toolchain
-        shell: bash
         run: |
           if [[ ${{ github.event_name }} == 'schedule' ]]; then
             echo "Building against latest rustc git version"
@@ -80,7 +80,7 @@ jobs:
           cargo -V
 
       - name: Test
-        run: bash ./ci.sh
+        run: ./ci.sh
 
   style:
     name: style checks
@@ -163,7 +163,6 @@ jobs:
       - name: Install zulip-send
         run: pip3 install zulip
       - name: Send Zulip notification
-        shell: bash
         env:
           ZULIP_BOT_EMAIL: ${{ secrets.ZULIP_BOT_EMAIL }}
           ZULIP_API_TOKEN: ${{ secrets.ZULIP_API_TOKEN }}