feat(relay/git): git on Sprout, S3-backed

.github/workflows/ci.yml

@@ -198,6 +198,7 @@ jobs:
             SPROUT_BIND_ADDR=0.0.0.0:3000 \
             SPROUT_REQUIRE_AUTH_TOKEN=false \
             SPROUT_RECONCILE_CHANNELS=true \
+            SPROUT_GIT_PROBE_WRITERS=8 \
             ./target/ci/sprout-relay > /tmp/sprout-relay.log 2>&1 &
           echo $! > /tmp/sprout-relay.pid
           for attempt in $(seq 1 60); do

crates/sprout-relay/Cargo.toml

@@ -46,6 +46,8 @@ base64 = "0.22"
 sprout-sdk = { workspace = true }
 sprout-workflow = { workspace = true, features = ["reqwest"] }
 sprout-media = { workspace = true }
+s3 = { version = "0.37", package = "rust-s3", default-features = false, features = ["tokio-rustls-tls", "fail-on-err", "tags"] }
+tempfile = "3"
 bytes = "1"
 infer = "0.19"
 serde_yaml      = { workspace = true }