ditto for manifest step

Author: adwk67

.github/workflows/build.yml

@@ -427,13 +427,15 @@ jobs:
         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.
+        # We can't rely on cargo set-version here as we will break semver rules when changing the version to make it
+        # specific to this PR e.g. 1.2.0 --> 1.2.0-pr678, so set it manually.
         if: ${{ github.event_name == 'pull_request' && github.ref != 'refs/heads/main' }}
         env:
           PR_NUMBER: ${{ github.event.pull_request.number }}
         run: |
           MANIFEST_VERSION=$(cargo metadata --format-version 1 --no-deps | jq -r '.packages[0].version')
           PR_VERSION="${MANIFEST_VERSION}-pr${PR_NUMBER}"
-          cargo set-version --offline --workspace "$PR_VERSION"
+          sed -i "s/version = \"${MANIFEST_VERSION}\"/version = \"${PR_VERSION}\"/" Cargo.toml
       - name: Build manifest list
         run: |
           # Creating manifest list