Add runner binary serving via orchestrator, update configurations and documentation

- Extend `.env.sample` with `RUNNER_DIR_HOST` for serving workflow runner binaries.
- Update `compose.yml` with `RUNNER_DIR` and corresponding volume mount.
- Add instructions for runner binary setup and serving in `README.md`.
- Enhance `mise.toml` with new tooling dependencies for building runners.

Signed-off-by: Till Wegmueller <toasterson@gmail.com>

deploy/podman/.env.sample

@@ -52,6 +52,10 @@ ORCH_IMAGES_DIR=/var/lib/solstice/images
 # Host working directory for per-VM overlays and logs; mounted read-write
 # The libvirt backend will use /var/lib/solstice-ci inside the container; map it to a persistent host path.
 ORCH_WORK_DIR=/var/lib/solstice-ci
+# Host directory containing workflow runner binaries to be served by the orchestrator
+# Files in this directory are served read-only at http(s)://runner.svc.${DOMAIN}/runners/{filename}
+# Default points to the workspace target/runners where mise tasks may place built artifacts.
+RUNNER_DIR_HOST=../../target/runners
 
 # Forge Integration secrets (set per deployment)
 # Shared secret used to validate Forgejo/Gitea webhooks (X-Gitea-Signature HMAC-SHA256)

deploy/podman/README.md

@@ -45,11 +45,11 @@ Quick start
 
 Services and routing
 - Traefik dashboard: https://traefik.svc.${DOMAIN} (protect with TRAEFIK_DASHBOARD_AUTH in .env)
-- Orchestrator HTTP: https://api.svc.${DOMAIN}
-- Orchestrator gRPC (h2/TLS via SNI): grpc.svc.${DOMAIN}
-- Forge webhooks: https://forge.svc.${DOMAIN}
-- GitHub webhooks: https://github.svc.${DOMAIN}
-- Runner static server: https://runner.svc.${DOMAIN}
+- Orchestrator HTTP: https://api.${ENV}.${DOMAIN}
+- Orchestrator gRPC (h2/TLS via SNI): grpc.${ENV}.${DOMAIN}
+- Forge webhooks: https://forge.${ENV}.${DOMAIN}
+- GitHub webhooks: https://github.${ENV}.${DOMAIN}
+- Runner static server: https://runner.${ENV}.${DOMAIN}
 - MinIO console: https://minio.svc.${DOMAIN}
 - S3 API: s3.svc.${DOMAIN}
 - RabbitMQ management: https://mq.svc.${DOMAIN}
@@ -141,6 +141,21 @@ Notes
 - Sockets and configs: compose binds libvirt control sockets and common libvirt directories read-only so the orchestrator can read network definitions and create domains.
 - If you change LIBVIRT_URI or LIBVIRT_NETWORK, update deploy/podman/.env and redeploy.
 
+Runner binaries (served by the orchestrator)
+
+- Purpose: Builder VMs download workflow runner binaries from the orchestrator over HTTP.
+- Host directory: Set RUNNER_DIR_HOST in deploy/podman/.env. This path is bind-mounted read-only into the orchestrator at /runners.
+  - Example (prod default in .env): RUNNER_DIR_HOST=/var/lib/solstice/runners
+  - Example (dev default in .env.sample): RUNNER_DIR_HOST=../../target/runners
+- URLs: Files are served at http(s)://runner.${ENV}.${DOMAIN}/runners/{filename}
+  - Example: https://runner.prod.${DOMAIN}/runners/solstice-runner-linux
+- Orchestrator injection: The orchestrator auto-computes default runner URLs from its HTTP_ADDR and contact address and injects them into cloud-init.
+  - You can override via env: SOLSTICE_RUNNER_URL (single) and SOLSTICE_RUNNER_URLS (space-separated list) to point VMs at specific filenames.
+- To build/place binaries:
+  - Build the workflow-runner crate for your target(s) and place the resulting artifacts in RUNNER_DIR_HOST with stable filenames (e.g., solstice-runner-linux, solstice-runner-illumos).
+  - Ensure file permissions allow read by the orchestrator user (world-readable is fine for static serving).
+- Traefik routing: runner.${ENV}.${DOMAIN} routes to the orchestrator’s HTTP port (8081 by default).
+
 
 Forge integration configuration
 

deploy/podman/compose.yml

@@ -190,6 +190,8 @@ services:
       AMQP_ROUTING_KEY: jobrequest.v1
       GRPC_ADDR: 0.0.0.0:50051
       HTTP_ADDR: 0.0.0.0:8081
+      # Directory inside the container to serve runner binaries from
+      RUNNER_DIR: /runners
       # Libvirt configuration for Linux/KVM
       LIBVIRT_URI: ${LIBVIRT_URI:-qemu:///system}
       LIBVIRT_NETWORK: ${LIBVIRT_NETWORK:-default}
@@ -208,6 +210,8 @@ services:
       - ${ORCH_IMAGES_DIR:-/var/lib/solstice/images}:/var/lib/solstice/images:Z
       # Writable bind for per-VM overlays and console logs (used by libvirt backend)
       - ${ORCH_WORK_DIR:-/var/lib/solstice-ci}:/var/lib/solstice-ci:Z
+      # Read-only bind for locally built workflow runner binaries to be served by the orchestrator
+      - ${RUNNER_DIR_HOST:-../../target/runners}:/runners:ro,Z
       # Libvirt control sockets (ro is sufficient for read-only, but write is needed to create domains)
       - /var/run/libvirt/libvirt-sock:/var/run/libvirt/libvirt-sock:Z
       - /var/run/libvirt/libvirt-sock-ro:/var/run/libvirt/libvirt-sock-ro:Z

mise.toml

@@ -1,5 +1,7 @@
 [tools]
 age = "latest"
+"cargo:cross" = "latest"
 fnox = "latest"
 protoc = "latest"
 python = "latest"
+rust = "latest"