docs: add repo readme with setup and usage instructions

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

readme.md

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+# mistralrs-package
+
+RPM packaging pipeline for [mistral.rs](https://github.com/EricLBuehler/mistral.rs) on Fedora 43 / x86_64 with CUDA support.
+
+This repo does not contain the mistral.rs source. It clones upstream at a given release tag, cross-compiles with CUDA, and produces signed RPMs published to a dnf repo at `rpm.lair.cafe`.
+
+## How it works
+
+Two Gitea Actions workflows drive the pipeline:
+
+1. **poll-upstream** runs every 15 minutes, checks GitHub for the latest mistral.rs release tag, and triggers a build if the corresponding RPM doesn't already exist on `rpm.lair.cafe`.
+2. **build-release** runs in three stages:
+   - **build** — clones upstream at the tag and compiles `mistralrs-server` with flavour-specific CUDA features on a `cuda-13.0` runner.
+   - **package** — builds an RPM from the compiled binary using `rpmbuild`.
+   - **publish** — GPG-signs the RPMs, rsyncs them to `rpm.lair.cafe`, and updates the repo metadata with `createrepo_c`.
+
+### Flavours
+
+Build flavours are defined in the workflow matrix. Each flavour specifies a name, CUDA home path, cargo features, and compute capabilities. The RPM spec uses `update-alternatives` so multiple flavours can coexist, with priority: base=10, fa=20, nccl=30.
+
+Currently defined:
+
+| Flavour  | Features                      | Compute cap |
+|----------|-------------------------------|-------------|
+| cuda13   | cuda, cudnn, flash-attn, nccl | sm_120      |
+
+### Systemd integration
+
+Each RPM installs a templated systemd unit (`mistralrs-<flavour>@.service`). Instances are configured via environment files in `/etc/mistralrs/`:
+
+```bash
+# copy the example config
+sudo cp /etc/mistralrs/cuda13.conf.example /etc/mistralrs/mymodel.conf
+# edit MISTRALRS_ARGS, HF_TOKEN, etc.
+sudo systemctl start mistralrs-cuda13@mymodel
+```
+
+## Infrastructure setup
+
+The RPM repo is hosted on `oolon` (oolon.kosherinata.internal) behind nginx with TLS via Let's Encrypt. The setup scripts in `script/setup/` are run once from a dev workstation with SSH access to oolon.
+
+### 1. DNS
+
+```bash
+./script/setup/dns.sh
+```
+
+Creates a CNAME record for `rpm.lair.cafe` via the Cloudflare API. Requires a Cloudflare API token in `~/.cloudflare/lair.cafe`.
+
+### 2. TLS certificate
+
+```bash
+./script/setup/cert.sh
+```
+
+Obtains a Let's Encrypt certificate for `rpm.lair.cafe` using the Cloudflare DNS challenge. Run on oolon.
+
+### 3. Nginx and repo directory
+
+```bash
+./script/setup/nginx.sh
+```
+
+Syncs the nginx config to oolon, creates the `gitea_ci` system user with SSH access for CI publishing, sets up the RPM repo directory at `/var/www/rpm/fedora/43/x86_64`, and reloads nginx. Requires the `gitea_ci` SSH public key at `~/.ssh/id_gitea_ci.pub`.
+
+### 4. GPG signing key
+
+```bash
+./script/setup/gpg.sh
+```
+
+Manages the RPM signing key in a dedicated keyring at `~/.gnupg/lair`:
+
+- Creates a certify-only ed25519 master key (no expiry) for `rpm@lair.cafe` if one doesn't exist.
+- Adds a signing subkey with 1-year expiry.
+- Cross-signs the key with your personal keys from the default keyring.
+- Exports the public key and syncs it to `oolon:/var/www/rpm/<short-id>.gpg`.
+
+After running the script, add two secrets to the Gitea repo:
+
+| Secret              | Value                                                                                   |
+|---------------------|-----------------------------------------------------------------------------------------|
+| `RPM_SIGNING_KEY`   | Output of `gpg --homedir ~/.gnupg/lair --armor --export-secret-subkeys <subkey-fpr>!`   |
+| `RPM_SIGNING_KEY_ID`| `rpm@lair.cafe`                                                                         |
+
+The trailing `!` in the export command restricts the export to that specific subkey. Only the signing subkey is shared with CI; the master key stays on the workstation.
+
+#### Rotating the signing subkey
+
+```bash
+gpg --homedir ~/.gnupg/lair --quick-add-key <master-fpr> ed25519 sign 1y
+```
+
+Then update the `RPM_SIGNING_KEY` secret in Gitea with the new subkey. The public key served to users doesn't change since it's anchored to the master key.
+
+## Client setup
+
+```bash
+sudo rpm --import https://rpm.lair.cafe/<short-id>.gpg
+sudo dnf config-manager addrepo --from-repofile=/dev/stdin <<EOF
+[lair-rpm]
+name=lair.cafe RPM repo
+baseurl=https://rpm.lair.cafe/fedora/43/x86_64
+enabled=1
+gpgcheck=1
+gpgkey=https://rpm.lair.cafe/<short-id>.gpg
+EOF
+sudo dnf install mistralrs-server-cuda13
+```
+
+## CI secrets
+
+The build-release workflow requires the following secrets:
+
+| Secret           | Purpose                                      |
+|------------------|----------------------------------------------|
+| `DISPATCH_TOKEN` | Gitea API token for triggering builds         |
+| `RPM_SIGNING_KEY`| ASCII-armored GPG signing subkey              |
+| `RPM_SIGNING_KEY_ID` | GPG key UID (`rpm@lair.cafe`)            |
+| `RSYNC_TARGET`   | SSH target for rsync (e.g. `gitea_ci@oolon`)  |
+| `RSYNC_SSH_KEY`  | SSH private key for the `gitea_ci` user       |