build_master_dev.yml drop redundant cosign pubkey save step

Author: vszakats

.github/workflows/build_master_dev.yml

@@ -93,8 +93,6 @@ jobs:
           cosign sign -y --key cosign.key ghcr.io/curl/curl-container/curl-dev-fedora:master
         env:
           COSIGN_PASSWORD: ${{secrets.COSIGN_PASSWORD}}
-      - name: Write public key to disk
-        run: echo "${{ secrets.COSIGN_PUBLIC_KEY }}" > cosign.pub
       - name: Verify image with public key
         run: |
           cosign verify --key cosign.pub ghcr.io/curl/curl-container/curl-dev-fedora:master