Skip download if specified staet file does not exist

Author: Rindrics

action.yml

@@ -56,16 +56,26 @@ runs:
           exit 1
         fi
 
-    - name: Perform action
+  - name: Perform action
       run: |
         if [ "${{ inputs.action }}" = "download" ]; then
           curl -L \
             -H "Accept: application/vnd.github+json" \
             -H "Authorization: Bearer ${{ inputs.token }}" \
             -H "X-GitHub-Api-Version: 2022-11-28" \
-            https://api.github.com/repos/${{ inputs.state_repo }}/contents/${{ inputs.state_path_remote }} > ${{ inputs.state_path_local }}.response
-          jq -r '.content' ${{ inputs.state_path_local }}.response | base64 --decode > ${{ inputs.state_path_local }}
-          echo "sha=$(jq -r '.sha' ${{ inputs.state_path_local }}" >> $GITHUB_OUTPUT
+            -o ${{ inputs.state_path_local }}.response \
+            -w "%{http_code}" \
+            https://api.github.com/repos/${{ inputs.state_repo }}/contents/${{ inputs.state_path_remote }} > response_code
+          HTTP_CODE=$(cat response_code)
+          if [ "$HTTP_CODE" -eq 200 ]; then
+            jq -r '.content' ${{ inputs.state_path_local }}.response | base64 --decode > ${{ inputs.state_path_local }}
+            echo "sha=$(jq -r '.sha' ${{ inputs.state_path_local }}.response)" >> $GITHUB_OUTPUT
+          elif [ "$HTTP_CODE" -eq 404 ]; then
+            echo "File not found, skipping download."
+          else
+            echo "Error: Received HTTP code $HTTP_CODE" >&2
+            exit 1
+          fi
         elif [ "${{ inputs.action }}" = "upload" ]; then
           if [ -z "${{ inputs.sha }}" ]; then
             echo "Error: sha input is required for upload action" >&2