fix syntax

Author: lionello

action.yaml

@@ -59,7 +59,7 @@ runs:
 
     - name: Defang Config Set
       shell: bash
-      if: ${{ inputs['config-env-vars'] != "" }}
+      if: ${{ inputs['config-env-vars'] != '' }}
       run: |
         # Iterate over the sources and set the environment variables
         params=()
@@ -77,7 +77,7 @@ runs:
         CONFIG_ENV_VARS: ${{ inputs['config-env-vars'] }}
 
     - name: Defang ${{ inputs['command'] }}
-      if: ${{ inputs['command'] != "" }}
+      if: ${{ inputs['command'] != '' }}
       shell: bash
       working-directory: ${{ inputs.cwd }}
       run: |