Update the docker containers

To avoid proliferation of versions, I suggest the following policy: the
oldest LTS release still receiving maintenance updates + the most recent
release for distributions that offer LTS releases.

For CentOS, this means CentOS7 and CentOS Stream 9 (since CentOS are all
"long-term support", this is just the oldest and the newest among
currently supported).

For Ubuntu, this means Ubuntu 18.04 (previous LTS are in "security fixes
only" mode) and Ubuntu 21.10. Recent Ubuntu attempts to be interactive
during the configuration of tzdata, required some additional setup.

In the common installation script, the logic for handling a
configured/built local directory breaks if `gmake` is detected as the
make binary; `make distclean` then fails inside the container because
not all systems have `gmake` symlink. Remove that attempt of a
workaround completely, just require that the host directory is clean.

Signed-off-by: Alexey Neyman <stilor@att.net>

1 files changed, 0 insertions, 11 deletions

diff --git a/testing/docker/alpine3.8/EXPERIMENTAL b/testing/docker/alpine3.8/EXPERIMENTAL
deleted file mode 100644
index 4d4d6d7..0000000
--- a/testing/docker/alpine3.8/EXPERIMENTAL
+++ /dev/null
@@ -1,11 +0,0 @@
-Support for Alpine Linux as a build or host platform is EXPERIMENTAL. Some of
-the packages try to compile binaries for the build or the machine and fail
-because they expect certain GLIBC-specific types, etc: Alpine Linux does not
-use GNU libc, it uses musl.
-
-Only the following bug reports will be looked into:
-- A sample configuration used to build successfully and no longer does. Identify
-the commit ID that builds successfully for you.
-- A pull request that fixes the build for any sample on the Alpine Linux.
-
-All other bug reports against Alpine as a build/host will be summarily closed.