ci: add tags (#165)

no tags are being added on merge to master so job is failing. i think we at least need `type=ref,event=branch`

Author: rdmulford

.github/workflows/docker-publish.yml

@@ -32,6 +32,8 @@ jobs:
           images: |
             target/captains-log
           tags: |
+            type=ref,event=branch
+            type=ref,event=pr
             type=semver,pattern={{version}}
             type=semver,pattern={{major}}.{{minor}}
             type=semver,pattern={{major}}