Use cosign and gh

Signed-off-by: Cary Phillips <[email protected]>

.github/workflows/release-sign.yml

@@ -13,45 +13,29 @@ permissions:
   repository-projects: write
 
 jobs:
-  release:
+  sign-release:
     name: Sign & upload release artifacts
     runs-on: ubuntu-latest
+    env:
+       tarball: Imath-${{ github.ref_name }}.tar.gz
 
     steps:
+      - name: Install Cosign
+        uses: sigstore/[email protected]
+        with:
+          cosign-release: 'v2.2.2'
 
       - name: Checkout
         uses: actions/checkout@v2
 
       - name: Create archive
-        run: git archive --format=tar.gz -o Imath-${{ github.ref_name }}.tar.gz ${{ github.ref_name }}
+        run: git archive --format=tar.gz -o ${{ env.tarball }} ${{ github.ref_name }}
 
       - name: Sign archive with Sigstore
-        uses: sigstore/[email protected]
-        with:
-          inputs: Imath-${{ github.ref_name }}.tar.gz
-
-      - name: Get release tag
-        id: get_release
-        uses: bruceadams/[email protected]
-        env:
-          GITHUB_TOKEN: ${{ github.token }}
+        run: cosign sign-blob --yes ${{ env.tarball }} --bundle ${{ env.tarball }}-cosign.bundle
 
       - name: Upload release archive
-        uses: actions/[email protected]
         env:
-          GITHUB_TOKEN: ${{ github.token }}
-        with:
-          upload_url: ${{ steps.get_release.outputs.upload_url }}
-          asset_path: Imath-${{ github.ref_name }}.tar.gz
-          asset_name: Imath-${{ github.ref_name }}.tar.gz
-          asset_content_type: application/zip
+          GH_TOKEN: ${{ github.token }}
+        run: gh release upload ${{ github.ref_name }} ${{ env.tarball }} ${{ env.tarball }}-cosign.bundle
 
-      - name: Upload release sigstore
-        uses: actions/[email protected]
-        env:
-          GITHUB_TOKEN: ${{ github.token }}
-        with:
-          upload_url: ${{ steps.get_release.outputs.upload_url }}
-          asset_path: Imath-${{ github.ref_name }}.tar.gz.sigstore
-          asset_name: Imath-${{ github.ref_name }}.tar.gz.sigstore
-          asset_content_type: application/zip