fixed action from exiting because a PR already existed.

action.yaml

@@ -13,7 +13,6 @@ inputs:
   token:
     description: "Gitea token with pull-request write access"
     required: true
-    default: ${{ secrets.GITHUB_TOKEN }}
   title:
     description: "Pull request title"
     required: true
@@ -67,9 +66,6 @@ runs:
 
         echo "::notice::Creating pull request ${REPOSITORY}: ${HEAD} -> ${BASE}"
 
-        echo "${GITEA_URL}"
-        echo "${REPOSITORY}"
-
         STATUS="$(
           curl -sS -o "$RESPONSE" -w "%{http_code}" \
             -X POST \
@@ -82,6 +78,13 @@ runs:
         if [ "$STATUS" != 201 ]; then
           cat "$RESPONSE"
           echo "----"
+
+          # Gitea returns 409 when a PR for this head/base is already open.
+          if jq -e '.message | test("already exists")' "$RESPONSE" >/dev/null; then
+            echo "::notice::Pull request already exists. Nothing to do."
+            exit 0
+          fi
+
           echo "::error::create failed with HTTP ${STATUS}"
           exit 1
         fi
@@ -91,3 +94,4 @@ runs:
         echo "url=$(jq -r '.url' "$RESPONSE")" >> "$GITHUB_OUTPUT"
         echo "html_url=$(jq -r '.html_url' "$RESPONSE")" >> "$GITHUB_OUTPUT"
         echo "::notice::Pull request #${NUMBER}: $(jq -r '.html_url' "$RESPONSE")"
+