Merge branch '2y-build-targets'

* 2y-build-targets:
  Pull in changes from master into 2y branch
  Update CI target
  Update from "3-year" target to "2y" target
  Switch from --sequences-per-group to --subsample-max-sequences
  adding in James's suggested  syntax and  function to specify that only h5nx and h5n1 should get 3 year builds
  fixing cleavage site export to include wildcards
  adding a time wildcard to allow for automatic building of a 3 year build and an all-time build. This commit introduces this new wildcard structure, as well as new functions for assigning strict clock rates for the 3 year trees
  adding another dairy cow and cat samples to include file
  updating time for 2 year build to '2Y', and adding a function to output the clock rate and clock rate standard deviation for the 2 year build
  adding new config, clades, and reference files for 2 year and all time h5nx builds
  adding in wildcard arguments that differ for all time and 2 year builds
  starting to stub out an h5nx build that is subsetted to the past 2 years

.github/workflows/ci.yaml

@@ -1,11 +1,11 @@
-name: CI
-
-on:
-  - push
-  - pull_request
-
-jobs:
-  ci:
-    uses: nextstrain/.github/.github/workflows/pathogen-repo-ci.yaml@master
-    with:
-      build-args: auspice/avian-flu_h5n1_ha.json
+name: CI
+
+on:
+  - push
+  - pull_request
+
+jobs:
+  ci:
+    uses: nextstrain/.github/.github/workflows/pathogen-repo-ci.yaml@master
+    with:
+      build-args: auspice/avian-flu_h5n1_ha_all-time.json