[epiphany] ci: use versioned python command

[Marge Bot <marge-bot src gnome org>]

commit 863c8b4c92b2a1098e8cd1175a55fb4e38fe04c0
Author: Michael Catanzaro <mcatanzaro gnome org>
Date:   Mon Oct 18 21:54:41 2021 +0000

    ci: use versioned python command
    
    The unversioned python has disappeared from our runtime images. And this is probably good, for safety.
    
    Part-of: <https://gitlab.gnome.org/GNOME/epiphany/-/merge_requests/1024>

 .gitlab-ci.yml | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index 5cd798bf8..0a84d34b9 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -80,7 +80,7 @@ canary:
     BUNDLE: 'epiphany-canary.flatpak'
   script:
     # TODO: Switch to debug? 5GB downloads though.
-    - python generate-canary-manifest.py --release
+    - python3 generate-canary-manifest.py --release
     - flatpak remote-add --user --if-not-exists webkit-sdk ${SDK_REPO}
     - flatpak-builder --user --install-deps-from=webkit-sdk --disable-rofiles-fuse --repo=repo 
canary_flatpak_app org.gnome.Epiphany.Canary.json
     - flatpak build-bundle repo ${BUNDLE} --runtime-repo=${SDK_REPO} org.gnome.Epiphany.Canary