versions: Use fixed, minor version for Alpine

- Set Alpine guest rootfs to 3.13 on all instances.
- Specify a minor version rather than patch level as the Alpine
  repositories use that.

Signed-off-by: Jakob Naucke <jakob.naucke@ibm.com>

tools/osbuilder/rootfs-builder/alpine/Dockerfile.in

@@ -4,7 +4,7 @@
 # SPDX-License-Identifier: Apache-2.0
 
 ARG IMAGE_REGISTRY=docker.io
-FROM ${IMAGE_REGISTRY}/alpine:3.13.5
+FROM ${IMAGE_REGISTRY}/alpine:3.13
 
 RUN apk update && apk add \
     apk-tools-static \

tools/osbuilder/rootfs-builder/alpine/config.sh

@@ -5,7 +5,7 @@
 
 OS_NAME="Alpine"
 
-OS_VERSION=${OS_VERSION:-latest-stable}
+OS_VERSION=${OS_VERSION:-3.13}
 
 BASE_PACKAGES="alpine-base"
 

versions.yaml

@@ -139,7 +139,7 @@ assets:
     architecture:
       aarch64:
         name: &default-initrd-name "alpine"
-        version: &default-initrd-version "3.13.5"
+        version: &default-initrd-version "3.13"
       # Do not use Alpine on ppc64le & s390x, the agent cannot use musl because
       # there is no such Rust target
       ppc64le: