add fluent-bit conf for gcp (#278)

* add fluent-bit conf

* address comment

* journald logs

* address comment

* Modify output match pattern for Fluent Bit

Updated Fluent Bit configuration to match all VM logs.

---------

Co-authored-by: Yu Hu <[email protected]>

Author: yuhuyoyo

startupscript/butane/gcp/fluent-bit.conf

@@ -0,0 +1,31 @@
+[SERVICE]
+    Flush 1
+
+[INPUT]
+    Name systemd
+    Tag vm-journald-startup-logs
+    Path /var/log/journal
+    Systemd_Filter _SYSTEMD_UNIT=devcontainer.service
+
+[INPUT]
+    Name systemd
+    Tag vm-journald-logs
+    Path /var/log/journal
+    Systemd_Filter _SYSTEMD_UNIT=docker.service
+    Systemd_Filter _SYSTEMD_UNIT=idle-shutdown.service
+    Systemd_Filter _SYSTEMD_UNIT=proxy-prober.service
+    Systemd_Filter _SYSTEMD_UNIT=proxy-readiness.service
+    Systemd_Filter _SYSTEMD_UNIT=locksmithd.service
+
+[INPUT]
+    Name tail
+    Tag vm-docker-logs
+    Parser docker
+    Path /var/lib/docker/containers/*/*.log
+    Path_key filepath
+    Skip_Long_Lines On
+    
+[OUTPUT]
+    name stackdriver
+    match vm-*
+    resource gce_instance