Dev env: adopt gitflow layout

Signed-off-by: Solomon Hykes <solomon@dagger.io>

.dagger/env/dev/.gitignore

@@ -0,0 +1,2 @@
+# dagger state
+state/**

.dagger/env/dev/plan/main.cue

@@ -0,0 +1,63 @@
+// A dagger workflow to develop dagger
+package main
+
+import (
+	"dagger.io/dagger"
+	"dagger.io/os"
+	"dagger.io/go"
+)
+
+// Dagger source code
+source: dagger.#Artifact @dagger(input)
+
+
+test: {
+	// Go unit tests
+	unit: {
+		logs: (os.#File & {
+			from: build.ctr
+			path: "/test.log"
+			read: format: "string"
+		}).read.data
+	}
+
+	// Full suite of bats integration tests
+	integration: {
+		// FIXME
+	}
+}
+
+// Build the dagger binaries
+build: {
+	ctr: go.#Container & {
+		"source": source
+		setup: [
+			"apk add --no-cache file",
+		]
+		command: """
+			go test -v ./... > /test.log
+			go build -o /binaries/ ./cmd/... > /build.log
+			"""
+	}
+
+	binaries: os.#Dir & {
+		from: ctr
+		path: "/binaries"
+	}
+
+	logs: (os.#File & {
+		from: ctr
+		path: "/build.log"
+		read: format: "string"
+	}).read.data
+}
+
+
+// Execute `dagger help`
+usage: os.#Container & {
+	command: "dagger help"
+
+	let binpath="/usr/local/dagger/bin"
+	mount: "\(binpath)": from: build.binaries
+	shell: search: "\(binpath)": true
+}

.dagger/env/dev/values.yaml

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+name: dev
+inputs:
+    source:
+        dir:
+            path: .
+            include: []
+sops:
+    kms: []
+    gcp_kms: []
+    azure_kv: []
+    hc_vault: []
+    age:
+        - recipient: age1ez5phfa2l6e9fqt4nnem734jajg4nlcefhv3ydeltzjlele47ags34868h
+          enc: |
+            -----BEGIN AGE ENCRYPTED FILE-----
+            YWdlLWVuY3J5cHRpb24ub3JnL3YxCi0+IFgyNTUxOSA4c0xSL1hJZmtsejN0dGpM
+            OCtpNFdLK0ZUdlc2YXBQV1RaazFpcERSOG5BClZzZGR3YllQODk5dGp5akpxVkhM
+            YUFxODJVeG1XbHl1WEVmNkMwREdldkkKLS0tIGNDVzNkak9UMnVyQkRHN3Q0TjZz
+            TWhsS0NUcU5ac0YrQjdmM0dlcEdRYWMKqUO/A83KsECVW+hSgVLTkIuK11VX3T77
+            fBSXL9D+riW9Q/TCKP0uMVulGnqZF4OoHAzLCug7aV6AEszpeSWyjg==
+            -----END AGE ENCRYPTED FILE-----
+    lastmodified: "2021-05-25T00:31:59Z"
+    mac: ENC[AES256_GCM,data:CMrCKRLDHc/o18zlVc/nwin1d14y2ruhk4i3mL/jtzDVeXDusJpelcgYAsNvKdhXU1v/gl1P4fINzQ4zc6t3krWW80UQFXBSZ1c2EJThKzVQfKFOwr3Fg3FyTm3zeX9Lk4e8z1SFmBj08k3jxr1xtdKwPKLmYN8e37cOy0bT97c=,iv:ffvYUpDxFLCyCynEVkFkBHCsp4HzLFcabiSjuCM0r40=,tag:ZwjW3qB8XcIvF+GoHjsbaQ==,type:str]
+    pgp: []
+    encrypted_suffix: secret
+    version: 3.7.1