Add make publish: build the image on the Docker host and push it to the registry

`script/publish` runs `script/docker` against the Docker host and pushes the image to the registry under four tags: the UTC date, the short commit hash, the branch name and `latest`. It refuses a working tree with uncommitted changes, since the hash tag names a commit.

Also carries sneak's `golines -m 77` line wrapping in three files, with no code change.

Unverified: a real build on the Docker host and a real push from this commit.
Deviation: sneak's FIXME comments are out, because the linter refuses them; they are #227, #228 and #229.

Model: opus-5-5
Co-authored-by: sneak <sneak@sneak.berlin>

Makefile

@@ -1,11 +1,12 @@
-.PHONY: bootstrap setup test lint fmt fmt-check tidy check docker hooks build \
-	run example-app
+.PHONY: bootstrap setup test lint fmt fmt-check tidy check docker publish \
+	hooks build run example-app
 
 # Makefile targets are thin shims; the implementations live in script/
 # per the scripts-to-rule-them-all pattern (see the Entrypoints section
 # of README.md). tidy writes go.mod and go.sum as `go mod tidy` does,
 # which test checks. build and run are for working on the code by hand;
-# example-app checks the image with an app built on it.
+# example-app checks the image with an app built on it; publish builds
+# the image on the Docker host and pushes it to the registry.
 
 bootstrap:
 	@script/bootstrap
@@ -34,6 +35,9 @@ check:
 docker:
 	@script/docker
 
+publish:
+	@script/publish
+
 hooks:
 	@script/install-precommit