Optimize tools installation

Author: alexeyr

.github/workflows/benchmark.yml

@@ -136,13 +136,14 @@ jobs:
 
       - name: Cache Fortio binary
         id: cache-fortio
+        if: contains(env.TOOLS, 'fortio')
         uses: actions/cache@v4
         with:
           path: ~/bin/fortio
           key: fortio-${{ runner.os }}-${{ runner.arch }}-${{ env.FORTIO_VERSION }}
 
       - name: Install Fortio
-        if: steps.cache-fortio.outputs.cache-hit != 'true'
+        if: contains(env.TOOLS, 'fortio') && steps.cache-fortio.outputs.cache-hit != 'true'
         run: |
           echo "📦 Installing Fortio v${FORTIO_VERSION}"
           
@@ -155,13 +156,14 @@ jobs:
 
       - name: Cache Vegeta binary
         id: cache-vegeta
+        if: contains(env.TOOLS, 'vegeta')
         uses: actions/cache@v4
         with:
           path: ~/bin/vegeta
           key: vegeta-${{ runner.os }}-${{ runner.arch }}-${{ env.VEGETA_VERSION }}
 
       - name: Install Vegeta
-        if: steps.cache-vegeta.outputs.cache-hit != 'true'
+        if: contains(env.TOOLS, 'vegeta') && steps.cache-vegeta.outputs.cache-hit != 'true'
         run: |
           echo "📦 Installing Vegeta v${VEGETA_VERSION}"
 
@@ -173,6 +175,7 @@ jobs:
           mv vegeta ~/bin/
 
       - name: Setup k6
+        if: contains(env.TOOLS, 'k6')
         uses: grafana/setup-k6-action@v1
         with:
           k6-version: ${{ env.K6_VERSION }}