chore(deps): update vexxhost/docker-atmosphere digest to 70f8dfc (#1159)

Signed-off-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>
Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Author: renovate[bot]

.github/workflows/build.yml

@@ -25,7 +25,7 @@ jobs:
         with:
           egress-policy: audit
 
-      - uses: vexxhost/docker-atmosphere/.github/actions/build-image@e22141dfd5b75c4109fab95427441cfa762bc770 # main
+      - uses: vexxhost/docker-atmosphere/.github/actions/build-image@70f8dfc6d54fdcfc58940cd93cecced306374ed7 # main
         with:
           image-name: python-openstackclient
           push: ${{ github.event_name != 'pull_request' }}