chore: add pb runner troubleshooting (#1432)

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## Changes

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docs-internal/infrastructure/pegboard/TROUBLESHOOTING.md

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+# Troubleshooting
+
+## Where are pegboard-manager logs?
+
+```bash
+cat /var/lib/rivet-client/logs
+```
+
+## Where are rivet-isolate-v8-runner logs?
+
+```bash
+cat /var/lib/rivet-client/runner/logs
+```
+
+## Why don't my runner logs exist?
+
+If there are no logs at `/var/lib/rivet-client/runner/logs`, the runner binary likely failed to spawn.
+
+Common causes:
+
+- The path to the binary is incorrect
+- Error loading libraries
+- The binary is not set as executable
+- The binary is for the wrong architecture
+
+Trying to manually find and run the binary usually resolves these issues.
+
+## Getting logs of crashed client in Docker
+
+If the container crashes, the logs have to be extracted from the volume.
+
+If log redirection is enabld (you'll see the log `Redirecting all logs to /var/lib/rivet-client/log`), the logs have to be extracted from the volume since the container is down.
+
+For example, to read the log from the volume `dev-full_client-data`, run this:
+
+```bash
+docker run --rm -it -v dev-full_client-data:/var/lib/rivet-client busybox cat /var/lib/rivet-client/log
+```
+