Release: CI Hotfix (#2536)

- check `rc` version in CI for `relase-candidate`

Author: mikedh

.github/workflows/release.yml

@@ -67,6 +67,9 @@ jobs:
       uses: actions/setup-python@a309ff8b426b58ec0e2a45f0f869d46889d02405 # v6.2.0
       with:
         python-version: '3.13'
+    - name: Check Candidate Version
+      if: github.ref != 'refs/heads/main'
+      run: python -c "from trimesh.version import __version__ as v; assert 'rc' in v.split('.')[2]"
     - name: Install publishing dependencies
       run: pip install build
     - name: Build
@@ -75,6 +78,7 @@ jobs:
       uses: pypa/gh-action-pypi-publish@ed0c53931b1dc9bd32cbe73a98c7f6766f8a527e # v1.13.0
 
   containers:
+    if: github.ref == 'refs/heads/main'
     name: Build Docker Images
     runs-on: ubuntu-latest
     permissions:
@@ -133,6 +137,7 @@ jobs:
       run: python tests/corpus.py -run
 
   release:
+    if: github.ref == 'refs/heads/main'
     permissions:
       contents: write  # for creating releases
     name: Create GitHub Release