fix(helm/generate-docs): lint generated files

Signed-off-by: Emilien Escalle <[email protected]>

Author: neilime

actions/helm/generate-docs/action.yml

@@ -95,7 +95,8 @@ runs:
         fix: true
         globs: ${{ steps.prepare-variables.outputs.working-directory }}/**/*.md
 
-    - run: npx textlint ${{ steps.prepare-variables.outputs.working-directory }}/**/*.md
+    - shell: bash
+      run: npx textlint ${{ steps.prepare-variables.outputs.working-directory }}/**/*.md
 
     - uses: actions/create-github-app-token@67018539274d69449ef7c02e8e71183d1719ab42 # v2.1.4
       if: inputs.github-app-id