[template][gitlab-ci] Specify the image to use for deploy and pypi jobs

Currently, these jobs uses the default image (whatever it is) but it
looks like a recent update removed curl from it and likely git as well
and thus breaks these jobs.

To avoid that, lets use the same image as the Linux build jobs since
they have all what is required.

bob/devtools/data/gitlab-ci/single-package.yaml

@@ -129,6 +129,7 @@ build_linux_310:
 # Deploy targets
 .deploy_template:
   extends: .bootstrap
+  image: quay.io/condaforge/linux-anvil-cos7-x86_64
   stage: deploy
   script:
     - git config --global --add safe.directory ${CI_PROJECT_DIR}
@@ -165,6 +166,7 @@ deploy_stable:
 
 pypi:
   extends: .bootstrap
+  image: quay.io/condaforge/linux-anvil-cos7-x86_64
   stage: pypi
   environment: pypi
   only: