Use cargo-action-fmt to annotate PRs (#7876)

[`cargo-action-fmt`][caf] reads `cargo` output and generates GitHub action
errors that properly annotate source locations.

This change updates our CI workflows to use `cargo-action-fmt` so that
errors are more clearly annotated in PRs.

[caf]: https://github.com/olix0r/cargo-action-fmt

Signed-off-by: Oliver Gould <[email protected]>

Author: olix0r

.github/workflows/policy_controller.yml

@@ -14,6 +14,7 @@ permissions:
   contents: read
 
 env:
+  CARGO_ACTION_FMT_VERSION: v0.1.3
   CARGO_INCREMENTAL: 0
   CARGO_NET_RETRY: 10
   RUST_BACKTRACE: short
@@ -52,9 +53,13 @@ jobs:
     container:
       image: docker://rust:1.56.1
     steps:
-      - uses: actions/checkout@ec3a7ce113134d7a93b817d10a8272cb61118579
       - run: rustup component add clippy
-      - run: cargo clippy --workspace --all-targets
+      - uses: actions/checkout@ec3a7ce113134d7a93b817d10a8272cb61118579
+      - run: |
+          bin/scurl -o /usr/local/bin/cargo-action-fmt "https://github.com/olix0r/cargo-action-fmt/releases/download/release%2F${CARGO_ACTION_FMT_VERSION}/cargo-action-fmt-x86_64-unknown-linux-gnu"
+          chmod 755 /usr/local/bin/cargo-action-fmt
+      - run: cargo fetch
+      - run: cargo clippy --frozen --all --message-format=json | cargo-action-fmt
 
   check:
     timeout-minutes: 20
@@ -63,13 +68,17 @@ jobs:
       image: docker://rust:1.56.1
     steps:
       - uses: actions/checkout@ec3a7ce113134d7a93b817d10a8272cb61118579
+      - run: |
+          bin/scurl -o /usr/local/bin/cargo-action-fmt "https://github.com/olix0r/cargo-action-fmt/releases/download/release%2F${CARGO_ACTION_FMT_VERSION}/cargo-action-fmt-x86_64-unknown-linux-gnu"
+          chmod 755 /usr/local/bin/cargo-action-fmt
+      - run: cargo fetch
       # Check each crate independently to ensure its Cargo.toml is sufficient.
       - run: |
           for toml in $(find . -mindepth 2 -name Cargo.toml | sort -r)
           do
             d=$(dirname "$toml")
             echo "# $d"
-            (cd $d ; cargo check --all-targets)
+            (cd $d ; cargo check --all-targets --frozen --message-format=json | cargo-action-fmt)
           done
 
   test: