Revamp docker build process (#1121)

* refactor docker building

* change to buildx

* disable branch filter

* disable tags

* matrix for building

* fix branch filter

* rename workflow

* sanitize ref name

* fix sanitization

* fix source command

* fix source command

* add push arg

* enable for all branches

* logs

* empty commit

* try freeing disk space

* try disk clean again

* try alpine

* Update ghcr.yml

* Update ghcr.yml

* move checkout

* ignore .git

* add disk space debug

* add df h to build script

* remove pull

* try another failure bypass

* remove maximize build space step

* remove df -h debug

* add no-root

* multi-stage python build

* add ssh

* update readme

* remove references to config.toml

.dockerignore

@@ -2,3 +2,4 @@ frontend/node_modules
 config.toml
 .envrc
 .env
+.git