Update alpine to 3.19

Signed-off-by: Christian König <ckoenig@posteo.de>

src/Dockerfile

@@ -1,5 +1,5 @@
-ARG CONTAINER="3.18"
-FROM alpine:${CONTAINER}
+ARG alpine_version="3.19"
+FROM alpine:${alpine_version}
 # https://docs.docker.com/engine/reference/builder/#automatic-platform-args-in-the-global-scope
 
 ARG TARGETPLATFORM

test/Dockerfile

@@ -1,4 +1,7 @@
-FROM docker:24.0.4-cli-alpine3.18
+ARG alpine_version="3.18"
+ARG docker_version="24.0.7"
+
+FROM docker:${docker_version}-cli-alpine${alpine_version}
 
 COPY --chmod=0755 ./cmd.sh /usr/local/bin/cmd.sh
 COPY --chmod=0755 ./entrypoint.sh /usr/local/bin/entrypoint.sh