fixed workflow

Author: adwk67

.github/workflows/build.yml

@@ -345,11 +345,11 @@ jobs:
           crate: cargo-edit
           bin: cargo-set-version
       - name: Update version if PR against main branch
-        if: ${{ github.event_name == 'pull_request' && github.ref == 'refs/heads/main' }}
+        if: ${{ github.event_name == 'pull_request' && github.event.pull_request.base.ref == 'refs/heads/main' }}
         run: cargo set-version --offline --workspace 0.0.0-pr${{ github.event.pull_request.number }}
       - name: Update version if PR against non-main branch
         # For PRs to be merged against a release branch, use the version that has already been set in the calling script.
-        if: ${{ github.event_name == 'pull_request' && github.ref != 'refs/heads/main' }}
+        if: ${{ github.event_name == 'pull_request' && startsWith(github.event.pull_request.base.ref, 'refs/heads/release-') }}
         env:
           PR_NUMBER: ${{ github.event.pull_request.number }}
         run: |
@@ -420,11 +420,11 @@ jobs:
           crate: cargo-edit
           bin: cargo-set-version
       - name: Update version if PR against main branch
-        if: ${{ github.event_name == 'pull_request' && github.ref == 'refs/heads/main' }}
+        if: ${{ github.event_name == 'pull_request' && github.event.pull_request.base.ref == 'refs/heads/main' }}
         run: cargo set-version --offline --workspace 0.0.0-pr${{ github.event.pull_request.number }}
       - name: Update version if PR against non-main branch
         # For PRs to be merged against a release branch, use the version that has already been set in the calling script.
-        if: ${{ github.event_name == 'pull_request' && github.ref != 'refs/heads/main' }}
+        if: ${{ github.event_name == 'pull_request' && startsWith(github.event.pull_request.base.ref, 'refs/heads/release-') }}
         env:
           PR_NUMBER: ${{ github.event.pull_request.number }}
         run: |