fix: Add shell key to action step that uses run

Author: aiakide

.github/actions/shared-build-steps/action.yml

@@ -23,6 +23,7 @@ runs:
         platforms: amd64,arm64
 
     - name: Free disk space 🧹
+      shell: bash
       run: |
         sudo swapoff -a
         sudo rm -f /swapfile

.github/workflows/main.yml

@@ -26,7 +26,6 @@ jobs:
 
       - uses: ./.github/actions/shared-build-steps
         with:
-          shell: bash
           dockerhub_user: ${{ secrets.DOCKERHUB_USER }}
           dockerhub_password: ${{ secrets.DOCKERHUB_PASSWORD }}
           runner_os: ${{ runner.os }}
@@ -64,7 +63,6 @@ jobs:
 
       - uses: ./.github/actions/shared-build-steps
         with:
-          shell: bash
           dockerhub_user: ${{ secrets.DOCKERHUB_USER }}
           dockerhub_password: ${{ secrets.DOCKERHUB_PASSWORD }}
           runner_os: ${{ runner.os }}