gha: moby-latest: make "Install Stable Docker" actually install

It was only downloading the script, but not executing. While at it,
also setting the '-f' (fail-fast), '-s' (silent, unless failing),
'-S' (force TLS), and '-L' (follow redirects) options that are
recommended when piping the output and executing it.

Signed-off-by: Sebastiaan van Stijn <[email protected]>

Author: thaJeztah

.github/workflows/moby-latest.yml

@@ -20,7 +20,7 @@ jobs:
 
       - name: Install Stable Docker
         if: ${{ matrix.install-docker-type == 'STABLE' }}
-        run: curl https://get.docker.com
+        run: curl -fsSL https://get.docker.com | sh
 
       - name: Install Docker from the TEST channel
         if: ${{ matrix.install-docker-type == 'ROOTFUL' }}