gear: Extract netboot artifacts

This changeset also adds a `config_url` and `options` keyword in the c3os config.
Along with that the config logic is changed so the configuration is taken also from boot commands and merged in the final installed config file.

go.mod

@@ -3,13 +3,17 @@ module github.com/c3os-io/c3os
 go 1.17
 
 require (
+	github.com/avast/retry-go v3.0.0+incompatible
 	github.com/bramvdbogaerde/go-scp v1.2.0
 	github.com/creack/pty v1.1.19-0.20220421211855-0d412c9fbeb1
 	github.com/denisbrodbeck/machineid v1.0.1
 	github.com/erikgeiser/promptkit v0.6.0
 	github.com/gliderlabs/ssh v0.2.2
 	github.com/google/go-github/v40 v40.0.0
+	github.com/google/shlex v0.0.0-20191202100458-e7afc7fbc510
+	github.com/hashicorp/go-multierror v1.1.1
 	github.com/ipfs/go-log v1.0.5
+	github.com/itchyny/gojq v0.12.2
 	github.com/jaypipes/ghw v0.9.0
 	github.com/joho/godotenv v1.4.0
 	github.com/mudler/edgevpn v0.15.2
@@ -71,12 +75,10 @@ require (
 	github.com/google/btree v1.0.1 // indirect
 	github.com/google/go-querystring v1.1.0 // indirect
 	github.com/google/gopacket v1.1.19 // indirect
-	github.com/google/shlex v0.0.0-20191202100458-e7afc7fbc510 // indirect
 	github.com/google/uuid v1.3.0 // indirect
 	github.com/gookit/color v1.5.0 // indirect
 	github.com/gorilla/websocket v1.5.0 // indirect
 	github.com/hashicorp/errwrap v1.1.0 // indirect
-	github.com/hashicorp/go-multierror v1.1.1 // indirect
 	github.com/hashicorp/golang-lru v0.5.4 // indirect
 	github.com/huin/goupnp v1.0.3 // indirect
 	github.com/ipfs/go-cid v0.2.0 // indirect
@@ -85,7 +87,6 @@ require (
 	github.com/ipfs/go-ipns v0.1.2 // indirect
 	github.com/ipfs/go-log/v2 v2.5.1 // indirect
 	github.com/ipld/go-ipld-prime v0.16.0 // indirect
-	github.com/itchyny/gojq v0.12.2 // indirect
 	github.com/itchyny/timefmt-go v0.1.2 // indirect
 	github.com/jackpal/go-nat-pmp v1.0.2 // indirect
 	github.com/jaypipes/pcidb v1.0.0 // indirect