Fix project default.

itchio/butler-push-previous-artifacts/action.yaml

@@ -29,8 +29,9 @@ inputs:
     description: "Itch.io account name."
     required: true
   project:
-    description: "Itch.io project name."
+    description: "Itch.io project name. Default: the repository name."
     required: true
+    default: ""
   channel:
     description: "Itch.io channel name."
     required: true
@@ -52,12 +53,23 @@ runs:
       password: ${{ inputs.password }}
       nugetPasswords: ${{ inputs.nugetPasswords || inputs.password }}
       unzipDir: ${{ inputs.unzipDir }}
+  - name: "Get Project name."
+    id: project
+    run: |
+      if [[ -n "${{ inputs.project }}" ]]; then
+        echo "destProject=${{ inputs.project }}" >> "$GITHUB_OUTPUT"
+      else
+        REPO="${{ github.repository }}"
+        REPO="${REPO##*/}"
+        echo "destProject=$REPO" >> "$GITHUB_OUTPUT"
+      fi
+    shell: bash
   - name: "Copy files to Itch.io."
     uses: act/common/itchio/butler-push@master
     with:
       file: ${{ steps.download.outputs.downloadedArtifactPath }}
       account: ${{ inputs.account }}
-      project: ${{ inputs.project }}
+      project: ${{ steps.project.outputs.destProject }}
       channel: ${{ inputs.channel }}
       apiKey: ${{ inputs.apiKey }}
       version: ${{ inputs.version }}