Run all benchmarks in CI

In the past we used Git LFS for retrieving large benchmark files and we
didn't want to waste upload/download bandwidth on every CI run. In
addition, we never intended to rely on CI benchmarks, for they are
running in a virtualized and generally unreliable (in terms of
consistent performance) environment.
Despite that, given that by now we switched to pulling said files from a
GitHub hosted Git repository with commit 80f35da ("Stop using Git
LFS for large benchmark files"), it is still somewhat interesting to
have all benchmarks run in CI.
With this change we do just that.

Signed-off-by: Daniel Müller <deso@posteo.net>

.github/workflows/test.yml

@@ -145,15 +145,20 @@ jobs:
              (echo "!!!! CHECKED IN C HEADER IS OUTDATED !!!!" && false)
   bench:
     name: Benchmark
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-22.04
+    env:
+       LLVM_GSYMUTIL: /usr/bin/llvm-gsymutil-14
     steps:
     - uses: actions/checkout@v3
     - uses: actions-rs/toolchain@v1
       with:
         toolchain: nightly
         profile: minimal
         override: true
-    - run: cargo bench --features=nightly,dont-generate-test-files
+    - name: Install required tools
+      run: sudo apt-get install -y llvm-14
+    - uses: Swatinem/rust-cache@v2.5.1
+    - run: cargo bench --features=nightly,generate-bench-files,dont-generate-test-files
   clippy:
     name: Lint with clippy
     runs-on: ubuntu-latest