rust: introduce xclippy project alias

Introduce 'cargo xclippy' alias for better control of enabling and
disabling clippy lints project-wide.

.cargo/config

@@ -0,0 +1,10 @@
+[alias]
+# Collection of project wide clippy lints. This is done via an alias because
+# clippy doesn't currently allow for specifiying project-wide lints in a
+# configuration file. This is a similar workaround to the ones presented here:
+# <https://github.com/EmbarkStudios/rust-ecosystem/issues/59>
+xclippy = [
+    "clippy", "--all-targets", "--",
+    "-Wclippy::all",
+    "-Wclippy::disallowed_methods",
+]

.github/workflows/nightly.yml

@@ -38,11 +38,9 @@ jobs:
           toolchain: beta
           components: clippy
           override: true
+      # See '.cargo/config' for list of enabled/disappled clippy lints
       - name: cargo clippy
-        uses: actions-rs/cargo@v1
-        with:
-          command: clippy
-          args: --all-targets -- -D clippy::all -D warnings -D clippy::disallowed_methods
+        run: cargo xclippy -D warnings
       - name: cargo test
         uses: actions-rs/cargo@v1
         with:

.github/workflows/rust.yml

@@ -85,11 +85,9 @@ jobs:
       - uses: bmwill/rust-cache@v1 # Fork of 'Swatinem/rust-cache' which allows caching additional paths
         with:
           path: ~/.cargo/registry/src/**/librocksdb-sys-*
+      # See '.cargo/config' for list of enabled/disappled clippy lints
       - name: cargo clippy
-        uses: actions-rs/cargo@v1
-        with:
-          command: clippy
-          args: --all-targets -- -D clippy::all -D warnings -D clippy::disallowed_methods
+        run: cargo xclippy -D warnings
 
   rustfmt:
     needs: diff