build: lightweight busybox-based container build

[outlook84]

Description

• Busybox as runtime base-image
• Use JSON.sh as lightweight json parser

Final image size:

Checklist

Before submitting your PR, please indicate which issues are either fixed or closed by this PR. See GitHub Help: Closing issues using keywords.

• I am aware the project is currently in maintenance-only mode. See README
• I am aware that translations MUST be made through Transifex and that this PR is NOT a translation update
• I am making a PR against the master branch.
• I am sure File Browser can be successfully built. See builds and development.

[jagadam97]

@outlook84
I taught you will be removing upx in this PR.
or do you want to go with upx along with busybox?? because the combo is gonna be like ~10MB docker image.

FYI:
(without any running processes)
filebrowser with out upx takes around 24MB ram
with upx takes around 30MB ram

cold start is not such a problem as the application is only few MB and decompressing it into ram not a huge time consumer

[jagadam97]

Ho you removed it now. Ok.

[outlook84]

@outlook84 I taught you will be removing upx in this PR. or do you want to go with upx along with busybox?? because the combo is gonna be like ~10MB docker image.

FYI: (without any running processes) filebrowser with out upx takes around 24MB ram with upx takes around 30MB ram

cold start is not such a problem as the application is only few MB and decompressing it into ram not a huge time consumer

22.5 MB image size is without upx.

I build filebrowser binary via cli, forgot to remove upx from workflow. Already done now.