Build: Use unannotated Git tags as version numbers

If a Git tag was created with `git tag $version`, it would not be
considered by `git describe`. Add the `--tags` parameter to fix this.

See also https://git-scm.com/docs/git-describe.

.drone.yml

@@ -7,9 +7,9 @@ steps:
     commands:
       - apk add --no-cache git
       - git fetch --tags
-      - git describe
-      - git describe > SEED
-      - echo -n $(git describe),latest > .tags
+      - git describe --tags
+      - git describe --tags > SEED
+      - echo -n $(git describe --tags),latest > .tags
   - name: test
     image: alpine:3.8
     commands:

build.sbt

@@ -8,7 +8,7 @@ def parseVersion(file: Path): Option[String] =
     .find(_.nonEmpty).map(_.trim)
 
 def seedVersion = parseVersion(Paths.get("SEED"))  // CI
-  .getOrElse(Seq("git", "describe").!!.trim)  // Local development
+  .getOrElse(Seq("git", "describe", "--tags").!!.trim)  // Local development
 def bloopVersion = parseVersion(Paths.get("BLOOP")).get
 def bloopCoursierVersion = parseVersion(Paths.get("COURSIER")).get