S3 Data Storage (#1)

Using the storage options [here](https://docs.gitea.com/administration/config-cheat-sheet#storage-storage), this commit pushes all packages, avatars, and LFS files to S3.

- Uses AWS S3.
- Frees up storage on EC2 instance, so packages do not eventually steal all of the free space.

Reviewed-on: #1
Co-authored-by: Max <git@maximhutz.me>
Co-committed-by: Max <git@maximhutz.me>

gitea/Dockerfile.dev

@@ -3,6 +3,8 @@ FROM gitea/gitea:latest-rootless
 ADD --chown=git:git config /etc/gitea
 ADD --chown=git:git custom /etc/gitea-custom
 
+ENV GITEA_CUSTOM=/etc/gitea-custom
+
 RUN rm /etc/gitea/app.ini
 RUN mv /etc/gitea/dev.app.ini /etc/gitea/app.ini