Added StreamingFast readme

README.sf.md

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+## StreamingFast Sei Fork Notes
+
+### Remotes & Branches
+
+```bash
+git remote set-url origin https://github.com/sei-protocol/sei-chain.git
+git remote add sf [email protected]:streamingfast/sei-chain.git
+```
+
+We maintain 3 branches:
+
+- `feature/firehose-tracer`
+- `feature/firehose-tracer-at-latest-release-tag`
+- `release/firehose`
+
+The `release/firehose` contains Dockerfile and instructions how to build images, this is the branch that should be used to make releases.
+
+The `feature/firehose-tracer` is the PR branch that tracks `origin/main` branch, `feature/firehose-tracer-at-latest-release-tag` is the same as `feature/firehose-tracer` but tracks the latest release tag, which as of time of writing is `v5.5.5`.
+
+### Bumping to new version
+
+```bash
+git fetch origin
+
+# Found correct tag to bump to, we will use `v5.5.6`
+export VERSION=v5.5.6
+
+git checkout feature/firehose-tracer-at-latest-release-tag
+git pull
+
+git merge "${VERSION:?}"
+# Fix any conflicts
+go test ./...
+git commit
+
+git checkout release/firehose
+git pull
+
+git merge feature/firehose-tracer-at-latest-release-tag
+# Fix any conflicts and merge, but there is usually no conflicts in this step
+
+git tag "${VERSION:?}-fh3.0"
+
+git push feature/firehose-tracer-at-latest-release-tag release/firehose "${VERSION:?}-fh3.0"
+```
+
+#### Building Binary & Docker
+
+Built manually for now on the GCP VM, here the commands we use to build it in our VM.
+
+> [!NOTE]
+> The instructions below **must** be run on the VM itself for now.
+
+```bash
+export SEID_REF=v5.5.5-fh3.0 \
+&& sudo -u sei git -C /data/build/seid/ fetch origin \
+&& sudo -u sei git -C /data/build/seid/ checkout "${SEID_REF:?}" \
+&& sudo -u sei bash -c 'source /etc/profile.d/02-golang.sh && cd /data/build/seid && make install' \
+&& sudo cp /home/sei/go/bin/seid /usr/local/bin/seid-"${SEID_REF:?}"
+```
+
+In this folder, copy the newly built binary as well as the libwasmvm.so file.
+Then build the Docker container and push it out. Here the commands to use.
+
+```
+# Assumed to be in `sei-chain` root folder, replace `sei0` in scp command to fit your own machine's name
+
+export SEID_REF=v5.5.6-fh3.0 \
+&& export FIREETH=v2.6.2 \
+&& export TAG="ghcr.io/streamingfast/firehose-ethereum:${FIREETH:?}-sei-${SEID_REF:?}" \
+&& scp sei0:/usr/local/bin/seid-${SEID_REF:?} . \
+&& docker build --platform=linux/amd64 --build-arg="FIREETH=${FIREETH:?}" --build-arg="SEID_BIN=seid-${SEID_REF:?}" -t "${TAG:?}" -f Dockerfile.sf . \
+&& docker run --rm -it "${TAG:?}" seid version \
+&& docker push "${TAG:?}"
+```