ci: lint dagger using dagger

- `Makefile` now uses `dagger do lint` to lint
- GHA uses dagger to lint

Signed-off-by: Andrea Luzzardi <aluzzardi@gmail.com>

ci.cue

@@ -5,12 +5,12 @@ import (
 
 	"universe.dagger.io/bash"
 	"universe.dagger.io/alpine"
-	"universe.dagger.io/docker"
 	"universe.dagger.io/go"
 
 	"github.com/dagger/dagger/ci/golangci"
 	"github.com/dagger/dagger/ci/shellcheck"
 	"github.com/dagger/dagger/ci/markdownlint"
+	"github.com/dagger/dagger/ci/cue"
 )
 
 dagger.#Plan & {
@@ -102,48 +102,8 @@ dagger.#Plan & {
 				files: ["./docs", "README.md"]
 			}
 
-			cue: docker.#Build & {
-				// FIXME: spin off into its own package?
-				steps: [
-					alpine.#Build & {
-						packages: bash: _
-						packages: curl: _
-						packages: git:  _
-					},
-
-					docker.#Copy & {
-						contents: _source
-						source:   "go.mod"
-						dest:     "go.mod"
-					},
-
-					// Install CUE
-					bash.#Run & {
-						script: contents: #"""
-								export CUE_VERSION="$(grep cue ./go.mod | cut -d' ' -f2 | head -1 | sed -E 's/\.[[:digit:]]\.[[:alnum:]]+-[[:alnum:]]+$//')"
-								export CUE_TARBALL="cue_${CUE_VERSION}_linux_amd64.tar.gz"
-								echo "Installing cue version $CUE_VERSION"
-								curl -L "https://github.com/cue-lang/cue/releases/download/${CUE_VERSION}/${CUE_TARBALL}" | tar zxf - -C /usr/local/bin
-								cue version
-						"""#
-					},
-
-					// CACHE: copy only *.cue files
-					docker.#Copy & {
-						contents: _source
-						include: ["*.cue"]
-						dest: "/cue"
-					},
-
-					// LINT
-					bash.#Run & {
-						workdir: "/cue"
-						script: contents: #"""
-							find . -name '*.cue' -not -path '*/cue.mod/*' -print | time xargs -t -n 1 -P 8 cue fmt -s
-							test -z "$(git status -s . | grep -e "^ M"  | grep "\.cue" | cut -d ' ' -f3 | tee /dev/stderr)"
-							"""#
-					},
-				]
+			"cue": cue.#Lint & {
+				source: _source
 			}
 		}
 	}