Work in progress: develop dagger with dagger

Signed-off-by: Solomon Hykes <sh.github.6811@hykes.org>

dev.cue

@@ -0,0 +1,80 @@
+package main
+
+import (
+	"strings"
+
+	"dagger.io/dagger"
+	"dagger.io/alpine"
+)
+
+// Dagger source code
+source: dagger.#Artifact
+
+// Go environment
+goenv: #Container & {
+	image: #ImageFromRef & {
+		ref: "docker.io/golang:1.16-alpine"
+	}
+
+	setup: "apk add --no-cache file"
+
+	volume: {
+		daggerSource: {
+			from: source
+			dest: "/src"
+		}
+		goCache: {
+			type: "cache"
+			dest: "/root/.cache/gocache"
+		}
+	}
+	env: {
+		GOMODCACHE:  volume.goCache.dest
+		CGO_ENABLED: "0"
+
+		let pathPrefixes = ["/", "/usr/", "/usr/local/", "/usr/local/go/"]
+		PATH: strings.Join([
+			for prefix in pathPrefixes {prefix + "sbin"},
+			for prefix in pathPrefixes {prefix + "bin"},
+		], ":")
+	}
+	command: {
+		debug: {
+			args: ["env"]
+			always: true
+		}
+		test: {
+			dir: "/src"
+			args: ["go", "test", "-v", "/src/..."]
+		}
+		build: {
+			dir: "/src"
+			args: ["go", "build", "-o", "/binaries/", "/src/cmd/..."]
+			outputDir: "/binaries"
+		}
+	}
+}
+
+runner: #Container & {
+	image: alpine.#Image & {
+		package: make: true
+	}
+
+	volume: daggerBinaries: {
+		from: goenv.command.build
+		dest: "/usr/local/dagger/bin"
+	}
+	env: PATH: "/bin:/usr/bin:/usr/local/bin:/usr/local/dagger/bin"
+
+	command: {
+		// Run `dagger help`
+		usage: args: ["dagger", "help"]
+		// FIXME: run integration tests
+
+		// Just a debug command to check that this config works
+		debug: {
+			args: ["env"]
+			env: FOO: "BAR"
+		}
+	}
+}