fix(cli): TRIGGER_BUILD_SKIP_REWRITE_TIMESTAMP escape hatch for local self-hosted builds (#3618)

## Summary

Local self-hosted deploys (`trigger deploy --local-build --push
--builder orbstack` or any other buildx setup using the **docker**
driver) fail at the push step with:

```
ERROR: failed to build: failed to solve:
  exporter option "rewrite-timestamp" conflicts with "unpack"
```

The docker driver auto-enables `unpack=true` when pushing, and that's
incompatible with `rewrite-timestamp` (which the CLI sets for
reproducible-build hashing).

Adds a simple env-var opt-out so contributors can keep using their
default builder. The flag is only read by the local-build code path;
remote/cloud builds are unaffected.

```bash
TRIGGER_BUILD_SKIP_REWRITE_TIMESTAMP=1 \
  pnpm exec trigger deploy --profile default --local-build --push --builder orbstack
```

The trade-off: skipping `rewrite-timestamp` means layer timestamps
reflect actual build time, so two identical builds produce different
layer hashes. Fine for a local-dev registry; the only real consumer of
timestamp-stability is registry-layer cache hit rates.

## Test plan

- [x] Manual: ran `trigger deploy --profile default --local-build --push
--builder orbstack` against the localhost webapp + a local Docker
registry on port 5001 — first failed with the rewrite-timestamp/unpack
error, then succeeded after setting
`TRIGGER_BUILD_SKIP_REWRITE_TIMESTAMP=1`.
- [x] Full chat.agent smoke sweep (15 tests, including suspend/resume,
deepResearch subtask, AgentChat orchestrator) against the deployed image
— all pass.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

.changeset/cli-deploy-skip-rewrite-timestamp.md

@@ -0,0 +1,5 @@
+---
+"trigger.dev": patch
+---
+
+Add `TRIGGER_BUILD_SKIP_REWRITE_TIMESTAMP=1` escape hatch for local self-hosted builds whose buildx driver doesn't support `rewrite-timestamp` alongside push (e.g. orbstack's default `docker` driver).

packages/cli-v3/src/deploy/buildImage.ts

@@ -1152,7 +1152,14 @@ function getOutputOptions({
     return outputOptions;
   }
 
-  const outputOptions: string[] = ["type=image", "oci-mediatypes=true", "rewrite-timestamp=true"];
+  // `rewrite-timestamp` is incompatible with the buildx docker driver's
+  // implicit `unpack=true` on push (used by e.g. orbstack's default builder).
+  // Provide an env-var escape hatch so local-dev deploys can opt out.
+  const skipRewriteTimestamp = process.env.TRIGGER_BUILD_SKIP_REWRITE_TIMESTAMP === "1";
+  const outputOptions: string[] = ["type=image", "oci-mediatypes=true"];
+  if (!skipRewriteTimestamp) {
+    outputOptions.push("rewrite-timestamp=true");
+  }
 
   if (imageTag) {
     outputOptions.push(`name=${imageTag}`);