Derive Bencher testbed slugs from actual runtime information (#7851)

Author: eddyashton

.github/workflows/bencher.yml

@@ -36,12 +36,21 @@ jobs:
 
       - name: "Machine info"
         shell: bash
-        run: |
+        run: &machine_info |
           set -ex
           uname -a
           nproc
           cat /proc/cpuinfo
           cat /proc/meminfo
+          cpuid=$(awk '/^cpu family/{f=$NF} /^model\t/{m=$NF} /^stepping/{s=$NF; printf "%02x%02x%02x",f,m,s; exit}' /proc/cpuinfo)
+          echo "CCF_CPUID=${cpuid}" >> "$GITHUB_ENV"
+          echo "CCF_CORES=$(nproc)" >> "$GITHUB_ENV"
+          echo "CCF_MEM_GB=$(awk '/^MemTotal/{printf "%d",$2/1024/1024}' /proc/meminfo)" >> "$GITHUB_ENV"
+          if [[ -e /dev/sev-guest ]]; then
+            echo "CCF_PLATFORM_SLUG=snp" >> "$GITHUB_ENV"
+          else
+            echo "CCF_PLATFORM_SLUG=virtual" >> "$GITHUB_ENV"
+          fi
 
       - name: "Install dependencies"
         shell: bash
@@ -86,12 +95,12 @@ jobs:
 
       - uses: bencherdev/bencher@main
       - name: Track base branch benchmarks with Bencher
-        run: |
+        run: &bencher_run |
           bencher run \
           --project ccf \
           --token '${{ secrets.BENCHER_API_TOKEN }}' \
           --branch main \
-          --testbed gha-vmss-d16av5-ci \
+          --testbed "${CCF_PLATFORM_SLUG}-${CCF_CPUID}-${CCF_CORES}cores-${CCF_MEM_GB}g" \
           --adapter json \
           --err \
           --file build/bencher.json
@@ -111,12 +120,7 @@ jobs:
 
       - name: "Machine info"
         shell: bash
-        run: |
-          set -ex
-          uname -a
-          nproc
-          cat /proc/cpuinfo
-          cat /proc/meminfo
+        run: *machine_info
 
       - name: "Confirm running on SEV-SNP"
         run: |
@@ -156,12 +160,4 @@ jobs:
 
       - uses: bencherdev/bencher@main
       - name: Track base branch benchmarks with Bencher
-        run: |
-          bencher run \
-          --project ccf \
-          --token '${{ secrets.BENCHER_API_TOKEN }}' \
-          --branch main \
-          --testbed gha-c-aci-ci \
-          --adapter json \
-          --err \
-          --file build/bencher.json
+        run: *bencher_run