fix(build): Run publish pipeline on tags

This *implies* that release-please creates those corresponding tags.
It dilutes the pipeline a bit and makes it less clear/linear.
However, it also allows publishing on manual tag pushes, not just releases.
Not that that should ever be done...

.github/workflows/publish.yml

@@ -6,6 +6,8 @@ on:
   push:
     branches:
       - main
+    tags:
+      - "v*"
   pull_request:
     branches:
       - main
@@ -83,9 +85,6 @@ jobs:
     runs-on: ubuntu-latest
     needs: tests
 
-    outputs:
-      created: ${{ steps.release.outputs.release_created }}
-
     steps:
       - uses: google-github-actions/release-please-action@v3
         id: release
@@ -97,8 +96,8 @@ jobs:
     name: Publish to PyPI
 
     runs-on: ubuntu-latest
-    needs: release-please
-    if: ${{ needs.release-please.outputs.created }}
+    needs: tests
+    if: ${{ github.ref_type == 'tag' }}
 
     steps:
       - uses: actions/checkout@v3
@@ -129,8 +128,8 @@ jobs:
     name: Build Docker image and push to GitHub Container Registry
 
     runs-on: ubuntu-latest
-    needs: release-please
-    if: ${{ needs.release-please.outputs.created }}
+    needs: tests
+    if: ${{ github.ref_type == 'tag' }}
 
     permissions:
       contents: read