chore: release: tag and sign latest too

Author: kaniini

.github/workflows/release.yml

@@ -38,11 +38,17 @@ jobs:
       with:
         file: ./Dockerfile
         platforms: linux/amd64,linux/aarch64
-        tags: "ghcr.io/edera-dev/hyperbench:${{ github.event.release.tag_name }}"
+        tags: "ghcr.io/edera-dev/hyperbench:${{ github.event.release.tag_name }},ghcr.io/edera-dev/hyperbench:latest"
         push: true
-    - name: cosign sign
+    - name: cosign sign tag
       run: cosign sign --yes "${TAGS}@${DIGEST}"
       env:
         DIGEST: "${{ steps.push.outputs.digest }}"
         TAGS: "ghcr.io/edera-dev/hyperbench:${{ github.event.release.tag_name }}"
         COSIGN_EXPERIMENTAL: "true"
+    - name: cosign sign latest
+      run: cosign sign --yes "${TAGS}@${DIGEST}"
+      env:
+        DIGEST: "${{ steps.push.outputs.digest }}"
+        TAGS: "ghcr.io/edera-dev/hyperbench:latest"
+        COSIGN_EXPERIMENTAL: "true"