ci: only push to crates io when tag is used

Author: piperRyan

.github/workflows/ci.yml

@@ -5,6 +5,8 @@ on:
     branches:
       - master
       - 'ft*'
+    tags:
+- "v*.*.*"
   pull_request:
     branches:
       - master
@@ -53,7 +55,7 @@ jobs:
     runs-on: ubuntu-latest
     needs: test
     environment: master
-    if: github.ref == 'refs/heads/master'
+    if: startsWith(github.ref, 'refs/tags/')
     steps:
       - name: Checkout repository
         uses: actions/checkout@v4