sig: initial draft schedule for next security sig meeting

Signed-off-by: Riyaz Faizullabhoy <riyaz.faizullabhoy@docker.com>

reports/sig-security/2017-06-21.md

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+# 2017-06-21
+Time: **9am PDT** (12pm EDT, 5pm BST) [see the time in your timezone](https://www.timeanddate.com/worldclock/fixedtime.html?msg=Linuxkit+Security+SIG&iso=20170621T09&p1=224)
+
+Meeting location: https://docker.zoom.us/j/779801882
+
+Announcement: Moby project forum post coming soon!
+
+Previous meeting notes: [2017-06-07](2017-06-07.md)
+
+## Agenda
+- Introductions & Administrivia (5 min)
+- signing: followup on last meeting's buildchain security discussion (15 min)
+  - current state of signing in LinuxKit, explanation of delegations for auditing
+  - propose pinning, policy, removing signatures
+- `landlock` deep dive - @l0kod (30 min)
+  - What is it Landlock LSM? What is eBPF? Why do we care?
+  - current state of the project, future patchsets and direction
+  - architecture deep dive
+  - demo
+- Project updates (10 min)
+- Next meeting: 2017-07-05
+  - deep dive TBD
+  - we can propose additional deep dives and discussion topics!
+
+## Meeting Notes