Initialize module and dependencies

vendor/github.com/emersion/go-imap/v2/.build.yml

@@ -0,0 +1,19 @@
+image: alpine/latest
+packages:
+  - dovecot
+  - go
+sources:
+  - https://github.com/emersion/go-imap#v2
+tasks:
+  - build: |
+      cd go-imap
+      go build -race -v ./...
+  - test: |
+      cd go-imap
+      go test -race ./...
+  - test-dovecot: |
+      cd go-imap
+      GOIMAP_TEST_DOVECOT=1 go test -race ./imapclient
+  - gofmt: |
+      cd go-imap
+      test -z $(gofmt -l .)