ci: add oras to generate-release workflow

changelogs.py needs oras CLI to fetch SBOMs for package diff generation.

Author: dylanmtaylor

.github/workflows/generate-release.yml

@@ -39,6 +39,9 @@ jobs:
           /home/linuxbrew/.linuxbrew/bin/brew install just
           echo "/home/linuxbrew/.linuxbrew/bin" >> $GITHUB_PATH
 
+      - name: Install ORAS
+        uses: oras-project/setup-oras@38de303aac69abb66f3e6255b7198bff35f323e3 # v2.0.0
+
       - name: Check Just Syntax
         shell: bash
         run: |