Do not trigger CI Pipeline during branching

Tally revisions and invoke ci-obs-upload accordingly

So, gitlab allows script execution to be clubbed together as a
single invocation. Hence, we invoke tally-revision script which will
return a 1 when the HEAD revision is same to the apertis/tags, thus
avoiding the invocation of ci-obs-upload script

2 cases where it will return a 0 and invoke ci-obs-upload script are:

* When the repository has no apertis/tags, which will be the case when
we are bringing in a new package
* When the revision of any of the apertis/tags do not match with HEAD

Signed-off-by: Ritesh Raj Sarraf <ritesh.sarraf@collabora.com>

The tally-revision scripts which should be part of apertis-package-source-builder image

$ cat tally-revision 
#!/bin/sh

set -e

HEAD=$(git rev-parse -q --verify HEAD)
TAGS=$(git tag -l apertis/*)

FOUND=1
if [ -z "$TAGS" ]; then
    echo "No tags found but we can be a new package"
    FOUND=0
else
    for tag in $TAGS;
    do
        check_tag=$(git rev-parse -q --verify $tag)
        if [ "$check_tag" != "$HEAD" ]; then
            FOUND=0
        fi
    done
fi

return $FOUND