ci: fix prepare-jmeter action

.github/actions/prepare-jmeter/action.yaml

@@ -16,6 +16,7 @@ runs:
     - name: load docker image
       env:
         PKG_VSN: ${{ inputs.version-emqx }}
+      shell: bash
       run: |
         EMQX_DOCKER_IMAGE_TAG=$(docker load < /tmp/emqx-docker-${PKG_VSN}.tar.gz | sed 's/Loaded image: //g')
         echo "_EMQX_DOCKER_IMAGE_TAG=$EMQX_DOCKER_IMAGE_TAG" >> $GITHUB_ENV
@@ -35,9 +36,9 @@ runs:
       with:
         name: apache-jmeter.tgz
     - name: install jmeter
-      timeout-minutes: 10
       env:
           JMETER_VERSION: 5.4.3
+      shell: bash
       run: |
         tar -xf apache-jmeter.tgz
         ln -s apache-jmeter-$JMETER_VERSION jmeter