You should follow the official Forgejo Contributor Guide. However it lacks a few useful things, below you can find.

It's recommended to use the devcontainer.

Building

To build, the official instructions generally suffice

Build a single image for multiple architectures:

podman build --platform linux/amd64,linux/arm64 --manifest user/repo:tag .

Replace the tag. You can add more architectures, if you wish.

Live reload

TAGS='sqlite sqlite_unlock_notify' make watch

Merge

Make sure you checked out the branch to merge to.

git remote add upstream https://codeberg.org/forgejo/forgejo.git
git fetch --no-tags upstream
git merge upstream/$BRANCH

Tag a release

git tag $TAG
git push origin tag $TAG

Build & release to hub

RELEASE_VERSION=13.0.4
podman build --build-arg RELEASE_VERSION=$RELEASE_VERSION --platform linux/amd64,linux/arm64 --manifest docker.io/git724/forgejo:$RELEASE_VERSION .
podman manifest push docker.io/git724/forgejo:$RELEASE_VERSION
podman manifest push git724/forgejo:$RELEASE_VERSION docker.io/git724/forgejo:latest

Binary:

make clean-all
TAGS="bindata timetzdata sqlite sqlite_unlock_notify" make build
make frontend