Revert "infra: Improve cache usage for container builds"

This reverts commit 5df7a8b.

Seems that cache-ttl is a new option for podman. Unfortunately, it
wasn't mentioned in the release notes so not sure in which version it
was added.

Anyway let's revert this for now.

Makefile.am

@@ -74,7 +74,7 @@ TEMPLATE_RENDERER = scripts/jinja-render
 
 CONTAINER_ENGINE ?= podman
 # build/run tweaks for all containers, such as --cap-add
-CONTAINER_BUILD_ARGS ?= --cache-ttl=3h
+CONTAINER_BUILD_ARGS ?= --no-cache
 # HACK: bash's builtin `test -r` fails when running on Ubuntu host (GitHub) due to incompatible seccomp profile
 CONTAINER_TEST_ARGS ?= $(shell grep -q ID=ubuntu /etc/os-release && echo --security-opt=seccomp=unconfined)
 CONTAINER_REGISTRY ?= quay.io