btrfs-progs: ci: fix parameter parsing in image running scripts

There's an unconditional 'shift' in the scripts that will lead to an
error "cannot shift" and this would fail inside CI. We want an implicit
run on current HEAD so shift only when there are more parameters.

Signed-off-by: David Sterba <dsterba@suse.com>

ci/ci-build-centos7

@@ -16,7 +16,9 @@ fi
 
 CIIMAGEDIR=ci/images/ci-centos-7-x86_64
 BRANCH=${1:-HEAD}
+if [ "$#" -ge 1 ]; then
 	shift
+fi
 HASH=$(git log -1 --format='%h %s' "$BRANCH")
 
 echo "CI: Generate archive from $BRANCH ($HASH)"

ci/ci-build-centos8

@@ -16,7 +16,9 @@ fi
 
 CIIMAGEDIR=ci/images/ci-centos-8-x86_64
 BRANCH=${1:-HEAD}
+if [ "$#" -ge 1 ]; then
 	shift
+fi
 HASH=$(git log -1 --format='%h %s' "$BRANCH")
 
 echo "CI: Generate archive from $BRANCH ($HASH)"

ci/ci-build-leap153

@@ -16,7 +16,9 @@ fi
 
 CIIMAGEDIR=ci/images/ci-openSUSE-Leap-15.3-x86_64
 BRANCH=${1:-HEAD}
+if [ "$#" -ge 1 ]; then
 	shift
+fi
 HASH=$(git log -1 --format='%h %s' "$BRANCH")
 
 echo "CI: Generate archive from $BRANCH ($HASH)"

ci/ci-build-leap154

@@ -16,7 +16,9 @@ fi
 
 CIIMAGEDIR=ci/images/ci-openSUSE-Leap-15.4-x86_64
 BRANCH=${1:-HEAD}
+if [ "$#" -ge 1 ]; then
 	shift
+fi
 HASH=$(git log -1 --format='%h %s' "$BRANCH")
 
 echo "CI: Generate archive from $BRANCH ($HASH)"

ci/ci-build-musl

@@ -16,7 +16,9 @@ fi
 
 CIIMAGEDIR=ci/images/ci-musl-x86_64
 BRANCH=${1:-HEAD}
+if [ "$#" -ge 1 ]; then
 	shift
+fi
 HASH=$(git log -1 --format='%h %s' "$BRANCH")
 
 echo "CI: Generate archive from $BRANCH ($HASH)"

ci/ci-build-tumbleweed

@@ -16,7 +16,9 @@ fi
 
 CIIMAGEDIR=ci/images/ci-openSUSE-tumbleweed-x86_64
 BRANCH=${1:-HEAD}
+if [ "$#" -ge 1 ]; then
 	shift
+fi
 HASH=$(git log -1 --format='%h %s' "$BRANCH")
 
 echo "CI: Generate archive from $BRANCH ($HASH)"