Firebase hosting channel (#6791) (#13053)

* Firebase Hosting Channels

* Use references site_id

* Add handwritten update test

* Use billing_project instead of project

* Remove dependence on a project

Signed-off-by: Modular Magician <magic-modules@google.com>

Signed-off-by: Modular Magician <magic-modules@google.com>

.changelog/6791.txt

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+```release-note:new-resource
+`google_firebase_hosting_channel`
+```

google/resource_firebase_hosting_channel_test.go

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+package google

website/docs/r/firebase_hosting_channel.html.markdown

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+---
+# ----------------------------------------------------------------------------
+#
+#     ***     AUTO GENERATED CODE    ***    Type: MMv1     ***
+#
+# ----------------------------------------------------------------------------
+#
+#     This file is automatically generated by Magic Modules and manual
+#     changes will be clobbered when the file is regenerated.
+#
+#     Please read more about how to change this file in
+#     .github/CONTRIBUTING.md.
+#
+# ----------------------------------------------------------------------------
+subcategory: "Firebase Hosting"
+page_title: "Google: google_firebase_hosting_channel"
+description: |-
+  A `Channel` represents a stream of releases for a site.
+---
+
+# google\_firebase\_hosting\_channel
+
+A `Channel` represents a stream of releases for a site. All sites have a default 
+`live` channel that serves content to the Firebase-provided subdomains and any
+connected custom domains.
+
+~> **Warning:** This resource is in beta, and should be used with the terraform-provider-google-beta provider.
+See [Provider Versions](https://terraform.io/docs/providers/google/guides/provider_versions.html) for more details on beta resources.
+
+To get more information about Channel, see:
+
+* [API documentation](https://firebase.google.com/docs/reference/hosting/rest/v1beta1/sites.channels)
+* How-to Guides
+    * [Official Documentation](https://firebase.google.com/docs/hosting)
+
+## Example Usage - Firebasehosting Channel Basic
+
+
+```hcl
+resource "google_firebase_hosting_site" "default" {
+  provider = google-beta
+  project  = "my-project-name"
+  site_id = "site-with-channel"
+}
+
+resource "google_firebase_hosting_channel" "default" {
+  provider = google-beta
+  site_id = google_firebase_hosting_site.default.site_id
+  channel_id = "channel-basic"
+}
+```
+## Example Usage - Firebasehosting Channel Full
+
+
+```hcl
+resource "google_firebase_hosting_site" "default" {
+  provider = google-beta
+  project  = "my-project-name"
+  site_id = "site-with-channel"
+}
+
+resource "google_firebase_hosting_channel" "full" {
+  provider = google-beta
+  site_id = google_firebase_hosting_site.default.site_id
+  channel_id = "channel-full"
+  ttl = "86400s"
+  retained_release_count = 20
+  labels = {
+    "some-key": "some-value"
+  }
+}
+```
+
+## Argument Reference
+
+The following arguments are supported:
+
+
+* `site_id` -
+  (Required)
+  Required. The ID of the site in which to create this channel.
+
+* `channel_id` -
+  (Required)
+  Required. Immutable. A unique ID within the site that identifies the channel.
+
+
+- - -
+
+
+* `retained_release_count` -
+  (Optional)
+  The number of previous releases to retain on the channel for rollback or other
+  purposes. Must be a number between 1-100. Defaults to 10 for new channels.
+
+* `labels` -
+  (Optional)
+  Text labels used for extra metadata and/or filtering
+
+* `expire_time` -
+  (Optional)
+  The time at which the channel will be automatically deleted. If null, the channel
+  will not be automatically deleted. This field is present in the output whether it's
+  set directly or via the `ttl` field.
+
+* `ttl` -
+  (Optional)
+  Input only. A time-to-live for this channel. Sets `expire_time` to the provided
+  duration past the time of the request. A duration in seconds with up to nine fractional
+  digits, terminated by 's'. Example: "86400s" (one day).
+
+
+## Attributes Reference
+
+In addition to the arguments listed above, the following computed attributes are exported:
+
+* `id` - an identifier for the resource with format `sites/{{site_id}}/channels/{{channel_id}}`
+
+* `name` -
+  The fully-qualified resource name for the channel, in the format:
+  sites/SITE_ID/channels/CHANNEL_ID
+
+
+## Timeouts
+
+This resource provides the following
+[Timeouts](/docs/configuration/resources.html#timeouts) configuration options:
+
+- `create` - Default is 20 minutes.
+- `update` - Default is 20 minutes.
+- `delete` - Default is 20 minutes.
+
+## Import
+
+
+Channel can be imported using any of these accepted formats:
+
+```
+$ terraform import google_firebase_hosting_channel.default sites/{{site_id}}/channels/{{channel_id}}
+$ terraform import google_firebase_hosting_channel.default {{site_id}}/{{channel_id}}
+```