Fix fallback value handling in the real-time benchmark

"{{ inputs.opcache || '1' }}" doesn't work the way I used to think: I assumed it only falls back to 1 if the input is not set (when a scheduled workflow runs). So this bug is fixed by overwriting the env vars in bash in case of manual workflows.

.github/workflows/real-time-benchmark.yml

@@ -67,11 +67,11 @@ jobs:
       COMMIT: ${{ github.sha }}
       BASELINE_COMMIT: "d5f6e56610c729710073350af318c4ea1b292cfe"
       ID: "master"
-      OPCACHE: ${{ inputs.opcache || '1' }}
-      BASELINE_OPCACHE: ${{ inputs.baseline_opcache || '2' }}
-      JIT: ${{ inputs.jit || '1' }}
-      INSTRUCTION_COUNT: ${{ inputs.instruction_count || '1' }}
-      RUN_MICRO_BENCH: ${{ inputs.run_micro_bench || '0' }}
+      OPCACHE: "1"
+      BASELINE_OPCACHE: "2"
+      JIT: "1"
+      INSTRUCTION_COUNT: "1"
+      RUN_MICRO_BENCH: "0"
       YEAR: ""
     steps:
       - name: Setup benchmark environment
@@ -97,6 +97,12 @@ jobs:
             echo "BASELINE_COMMIT=$BASELINE_COMMIT" >> $GITHUB_ENV
 
             echo "ID=benchmarked" >> $GITHUB_ENV
+
+            echo "OPCACHE=${{ inputs.opcache }}" >> $GITHUB_ENV
+            echo "BASELINE_OPCACHE=${{ inputs.baseline_opcache }}" >> $GITHUB_ENV
+            echo "JIT=${{ inputs.jit }}" >> $GITHUB_ENV
+            echo "INSTRUCTION_COUNT=${{ inputs.instruction_count }}" >> $GITHUB_ENV
+            echo "RUN_MICRO_BENCH=${{ inputs.run_micro_bench }}" >> $GITHUB_ENV
           fi
 
       - name: Install dependencies