feat: migrate builds plugin to go and track per-build records

Adds typed JSON build records under data/builds/<app>/<build-id>.{json,log} keyed on a stable base36 ULID-style DOKKU_BUILD_ID generated for every deploy. The new commands surface that history (builds:list, builds:info, builds:prune) and an operator-configurable retention via builds:set retention. The existing builds:cancel and builds:output now key on the build-id (with safe handling for already-finalized and abandoned records), and the per-build log file replaces journalctl as the durable source of truth for builds:output.

plugins/builds/go.mod

@@ -0,0 +1,30 @@
+module github.com/dokku/dokku/plugins/builds
+
+go 1.26.2
+
+require (
+	github.com/dokku/dokku/plugins/common v0.0.0-00010101000000-000000000000
+	github.com/multiformats/go-base36 v0.2.0
+	github.com/ryanuber/columnize v2.1.2+incompatible
+	github.com/spf13/pflag v1.0.10
+)
+
+require (
+	github.com/alexellis/go-execute/v2 v2.2.1 // indirect
+	github.com/fatih/color v1.19.0 // indirect
+	github.com/hashicorp/errwrap v1.0.0 // indirect
+	github.com/hashicorp/go-multierror v1.1.1 // indirect
+	github.com/kr/fs v0.1.0 // indirect
+	github.com/mattn/go-colorable v0.1.14 // indirect
+	github.com/mattn/go-isatty v0.0.20 // indirect
+	github.com/melbahja/goph v1.5.0 // indirect
+	github.com/otiai10/copy v1.14.1 // indirect
+	github.com/otiai10/mint v1.6.3 // indirect
+	github.com/pkg/errors v0.9.1 // indirect
+	github.com/pkg/sftp v1.13.10 // indirect
+	golang.org/x/crypto v0.50.0 // indirect
+	golang.org/x/sync v0.20.0 // indirect
+	golang.org/x/sys v0.43.0 // indirect
+)
+
+replace github.com/dokku/dokku/plugins/common => ../common