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Updates for the COmanage Registry 3.2.4 release.

Updated the README.md documentation for the Shibboleth SP base
image.

Update the Shibboleth SP base image and the default for the
COmanage Registry Shibboleth SP image to use version 3.1.0
of the Shibboleth SP.

Fix a typo in the documentation for simple development sandbox.

Fix typos with the SetEnv configuration directives so that they match
the defaults for EnvSource configuration.

Added a note that one can add a username used in basic auth
that mocks up what the Shibboleth SP or other authentication module
will populate into REMOTE_USER.

Added details to the documentation for the simple development sandbox
for how to add more test users and how to mock up Apache CGI environment
variables.

Add documentation with an example directory a Mac OS user would use when
making a directory for database state, as part of the simple development
sandbox instructions. Also update the version to 3.2.3 for the
evaluation documenation.

First commit of instructions for deploying a simple
development sandbox using Docker.

Prevent sed from creationg a backup of bootstrap.php when
it is edited in place by the entrypoint script.

The upstream PostgreSQL image now requires that POSTGRES_PASSWORD
be set. This commit sets POSTGRES_PASSWORD to be the value
of COMANAGE_REGISTRY_POSTGRES_USER_PASSWORD if not set,
or uses the Dockerfile default of password.

Document the use of the COMANAGE_REGISTRY_NO_DATABASE_CONFIG environment
variable in the README.md file for the cron image.

Update the main README.md documentation page with a link to the
documentation for the COmanage Registry cron image.

If the environment variable OLC_ROOT_DN_PASSWORD is set but OLC_ROOT_DN
(usually a hash) is not and is set to the Dockerfile default of
'password', then take OLC_ROOT_DN from OLC_ROOT_DN_PASSWORD.

Add logic so that if the environment variable
COMANAGE_REGISTRY_NO_DATABASE_CONFIG exists then the entrypoint script
will not attempt to create the database.php file. Likewise if
COMANAGE_REGISTRY_NO_EMAIL_CONFIG exists then the entrypoint script will
not attempt to create the email.php file.

If the environment variable OLC_ROOT_DN_PASSWORD is set but OLC_ROOT_DN
(usually a hash) is not, then take OLC_ROOT_DN from
OLC_ROOT_DN_PASSWORD.

Update the base image for comanage-registry-slapd-base to use
debian:10.3.

Updated the build for the Shibboleth SP base image to use debian:buster
as the base and the appropriate development libraries for that base.

Updated the PHP version for the I2 TAP base image to version
7.3.13.

Revert mod_auth_openidc to version 2.3.11 after finding with
that environment variables for claims are not being set the same in the
2.4.x series.

First commit of COmanage Registry Cron, intended to build a COmanage
Registry image that uses cron to execute COmanage Registry JobShell
jobs.

Updated to use version 2.4.04 of mod_auth_openidc and Debian buster as
the base.

Updated the base to PHP 7.3.13 and switched to using Debian buster.

Added the django-request-logging package to mailman-web to assist when
necessary with debugging by being able to easily log the requests
recevied by the mailman-web service.

Added the MailHeaderMiddleware to settings.py for the mailman-web
service.

Add missing - to read from stdin

Directories on host should start with /srv/docker

Fix permission on patched code

expose COMANAGE_REGISTRY_SRC_URL as a build arg

Fixed missing colon in yaml