v1.3-20240814

build: add syntax for local build

    Due to the line `ARCH=${TARGETPLATFORM#linux/}`,
    we need to define the syntax to make docker build happy.

Signed-off-by: Vicente Cheng <vicente.cheng@suse.com>
(cherry picked from commit 785f4ddf980d575aae675f6b339d358af04ac83a)

Conflicts:
	Dockerfile
	  - keep the baseos on v1.3