docker and CI (#1)

Reviewed-on: #1
Co-authored-by: Michael Thomson <michael@michaelthomson.dev>
Co-committed-by: Michael Thomson <michael@michaelthomson.dev>

.woodpecker/publish-tag.yaml

@@ -0,0 +1,18 @@
+steps:
+  publish-tag:
+    image: woodpeckerci/plugin-kaniko
+    settings:
+      repo: gitea.michaelthomson.dev/${CI_REPO_OWNER}/go-todos-app
+      registry: https://gitea.michaelthomson.dev
+      tags: ${CI_COMMIT_TAG}
+      username: ${CI_REPO_OWNER}
+      password:
+        from_secret: gitea_token
+    when:
+      event: tag
+      ref: refs/tags/v*
+      branch: main
+
+depends_on:
+  - build
+  - dryrun