Add images for PHP 7.4 and 8.0

See merge request !18

Update Golang image for Buster

See merge request !17

Add dependencies for building Debian packages

See merge request !16

Restore WP.org plugin image as a submodule

See merge request !15

Remove WP.org plugin-deploy image

See merge request !14

Slim down Debian images

See merge request !13

Introduce slim image for WP.org plugin deploys

See merge request !12

PHP: add rsync

See merge request !11

PHP: add git to all images; Go: update golint path

See merge request !10

PHP: add git to all images; Go: update golint path

See merge request !9

See https://github.com/golang/lint/commit/ead987a65e5c7e053cf9633f9eac1f734f6b4fe3

Its presence is reasonable alongside subversion.

Add buster image

See merge request !8

These were included in a misguided attempt to fix the nginx build process, which was failing due to OpenSSL not supporting parallel make jobs.

This is purely copy-pasta from the Stretch build.

Add Stretch

See merge request !7

THis is purely copy-pasta from the Jessie build.

Add Debian Jessie build image

See merge request !6

https://github.com/koalaman/shellcheck/issues/1069

Automated image builds for registry

Closes #2, #3, and #1

See merge request !5