ci(all-features): add -D warnings to cargo check-all-features

Author: rami3l

.github/workflows/ci.yaml

@@ -1316,6 +1316,8 @@ jobs:
         run: |
           rustup target install "$TARGET"
       - name: Build every combination
+        env:
+          RUSTFLAGS: -D warnings
         run: |
           cargo check-all-features --root-only
 

ci/actions-templates/all-features-template.yaml

@@ -38,5 +38,7 @@ jobs: # skip-all
         run: |
           rustup target install "$TARGET"
       - name: Build every combination
+        env:
+          RUSTFLAGS: -D warnings
         run: |
           cargo check-all-features --root-only