Make cross prefix configurable in benchmark action and workflow

Signed-off-by: Hanno Becker <[email protected]>

.github/actions/bench/action.yml

@@ -27,14 +27,17 @@ inputs:
     description: Whether to push results to GH pages
     default: "false"
   gh_token:
-     description: GitHub access token
-     required: true
+    description: GitHub access token
+    required: true
   use-nix:
     description: Whether to run in the default Nix environment
     default: "true"
   custom_shell:
     description: The shell to use. Only relevant if use-nix is "false"
     default: "bash"
+  cross_prefix:
+    description: "Binary prefix for cross-compilation builds"
+    default: ""
 runs:
   using: composite
   steps:
@@ -62,7 +65,7 @@ runs:
     - name: Run benchmark
       shell: ${{ env.SHELL }}
       run: |
-        tests bench -c ${{ inputs.perf }} --cflags="${{ inputs.cflags }}" --arch-flags="${{ inputs.archflags }}" --opt="${{ inputs.opt }}" -v --output=output.json ${{ inputs.bench_extra_args }}
+        tests bench -c ${{ inputs.perf }} --cross-prefix="${{ inputs.cross_prefix }}" --cflags="${{ inputs.cflags }}" --arch-flags="${{ inputs.archflags }}" --opt="${{ inputs.opt }}" -v --output=output.json ${{ inputs.bench_extra_args }}
     - name: Store benchmark result
       if: ${{ inputs.store_results }}
       uses: benchmark-action/github-action-benchmark@v1

.github/workflows/bench_ec2_any.yml

@@ -43,6 +43,9 @@ on:
       bench_extra_args:
         description: Additional command line to be appended to `tests bench` script
         default: ''
+      cross_prefix:
+        description: "Binary prefix for cross-compilation builds"
+        default: ""
 jobs:
   bench-ec2-any:
     name: Ad-hoc benchmark on $${{ inputs.ec2_instance_type }}
@@ -58,4 +61,5 @@ jobs:
       store_results: ${{ inputs.store_results }}
       always_terminate: ${{ inputs.always_terminate }}
       bench_extra_args: ${{ inputs.bench_extra_args }}
+      cross_prefix: ${{ inputs.cross_prefix }}
     secrets: inherit

.github/workflows/bench_ec2_reusable.yml

@@ -44,6 +44,10 @@ on:
         type: string
         description: Additional command line to be appended to `bench` script
         default: ''
+      cross_prefix:
+        type: string
+        description: "Binary prefix for cross-compilation builds"
+        default: ""
 env:
   AWS_ROLE: arn:aws:iam::559050233797:role/mlkem-c-aarch64-gh-action
   AWS_REGION: us-east-1
@@ -111,6 +115,7 @@ jobs:
           store_results: ${{ inputs.store_results }}
           bench_extra_args: ${{ inputs.bench_extra_args }}
           gh_token: ${{ secrets.AWS_GITHUB_TOKEN }}
+          cross_prefix: ${{ inputs.cross_prefix }}
   stop-ec2-runner:
     name: Stop ${{ inputs.name }} (${{ inputs.ec2_instance_type }})
     permissions: