No nightly clippy except weekly (#1670)

Also removes dependabot.yml since defaults should be sufficient. This was causing problems with the Azure/azure-sdk-for-rust-pr repo.

Author: heaths

.github/dependabot.yml

@@ -3,6 +3,8 @@ name: Build and Test
 on:
   pull_request:
   push:
+  schedule:
+    - cron: "0 0 * * 0"
 
 env:
   RUSTFLAGS: -Dwarnings
@@ -18,7 +20,7 @@ jobs:
       - uses: actions/checkout@v4
       - id: get_msrv
         run: |
-          MSRV=$(cargo metadata --format-version=1 --no-deps  | jq '.packages[] | select(.name == "azure_core").rust_version' -r)
+          MSRV=$(cargo metadata --format-version=1 --no-deps | jq '.packages[] | select(.name == "azure_core").rust_version' -r)
           echo setting msrv to ${MSRV}
           echo msrv=${MSRV} >> "$GITHUB_OUTPUT"
 
@@ -113,12 +115,16 @@ jobs:
           - false
         include:
           - build: nightly
+            clippy: false
             experimental: true
+          - clippy: true
     steps:
       - uses: actions/checkout@v4
       - uses: Swatinem/rust-cache@v2
         with:
           workspaces: services
+      - run: echo "NO_CLIPPY=true" >> $GITHUB_ENV
+        if: github.event_name != 'schedule' && ! matrix.clippy
       - run: eng/scripts/services_tests.sh ${{ matrix.build }}
       - name: display free disk space
         run: df -h /

.github/workflows/build.yml

@@ -12,5 +12,7 @@ rustup component add rustfmt clippy --toolchain ${BUILD}
 export RUSTFLAGS="-Dwarnings -Aunreachable-code -Aunused-assignments -Adead-code -Aclippy::new-without-default -Aclippy::unnecessary_to_owned"
 cargo +${BUILD} check --manifest-path services/Cargo.toml --all
 cargo +${BUILD} check --manifest-path services/Cargo.toml --examples
-cargo +${BUILD} clippy --manifest-path services/Cargo.toml --all
+if [ -z $NO_CLIPPY ]; then
+    cargo +${BUILD} clippy --manifest-path services/Cargo.toml --all
+fi
 cargo +${BUILD} fmt --manifest-path services/Cargo.toml --all -- --check