[ci] Update buildah command and version

.gitlab-ci.yml

@@ -49,7 +49,8 @@ variables:
   DOCKER_OS: "debian:stretch"
   ARCH: "x86_64"
   CI_IMAGE: "paritytech/ci-linux:production"
-  BUILDAH_IMAGE: "quay.io/buildah/stable:v1.27"
+  BUILDAH_IMAGE: "quay.io/buildah/stable:v1.29"
+  BUILDAH_COMMAND: "buildah --storage-driver overlay2"
   RELENG_SCRIPTS_BRANCH: "master"
   RUSTY_CACHIER_SINGLE_BRANCH: master
   RUSTY_CACHIER_DONT_OPERATE_ON_MAIN_BRANCH: "true"

scripts/ci/gitlab/pipeline/publish.yml

@@ -19,7 +19,7 @@
   script:
     - test "$DOCKER_USER" -a "$DOCKER_PASS" ||
       ( echo "no docker credentials provided"; exit 1 )
-    - buildah bud
+    - $BUILDAH_COMMAND build
       --format=docker
       --build-arg VCS_REF="${CI_COMMIT_SHA}"
       --build-arg BUILD_DATE="$(date -u '+%Y-%m-%dT%H:%M:%SZ')"
@@ -29,9 +29,9 @@
       --file "$DOCKERFILE" .
     - echo "$DOCKER_PASS" |
       buildah login --username "$DOCKER_USER" --password-stdin docker.io
-    - buildah info
-    - buildah push --format=v2s2 "$IMAGE_NAME:$VERSION"
-    - buildah push --format=v2s2 "$IMAGE_NAME:latest"
+    - $BUILDAH_COMMAND info
+    - $BUILDAH_COMMAND push --format=v2s2 "$IMAGE_NAME:$VERSION"
+    - $BUILDAH_COMMAND push --format=v2s2 "$IMAGE_NAME:latest"
   after_script:
     - buildah logout --all
     - echo "SUBSTRATE_IMAGE_NAME=${IMAGE_NAME}" | tee -a ./artifacts/$PRODUCT/build.env