Add checksum for wheel artifact and also add version.txt

Author: harrryr

.github/workflows/release-build.yml

@@ -127,3 +127,24 @@ jobs:
              --draft \
              "v${{ github.event.inputs.version }}" \
              aws-opentelemetry-agent.jar
+
+      - name: Get SHA256 checksum of wheel file
+        id: get_sha256
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+        run: |
+          checksum=$(shasum -a 256 aws-opentelemetry-agent.jar | awk '{ print $1 }')
+          echo "CHECKSUM=$checksum" >> $GITHUB_OUTPUT
+
+      - name: Append checksum and update version
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+        run: |
+          echo "${{ github.event.inputs.version }} ${{ steps.get_sha256.outputs.CHECKSUM }}" >> checksum.txt
+          echo "${{ github.event.inputs.version }}" > version.txt
+
+          git config --local user.email "github-actions[bot]@users.noreply.github.com"
+          git config --local user.name "GitHub Action Release Workflow"
+          git add checksum.txt version.txt
+          git commit -m "Update latest version and append checksum"
+          git push