Add new configuration document for connection gcp

docs/reference/config-files/connection/gcp.md

@@ -0,0 +1,107 @@
+---
+title: gcp
+sidebar_label: gcp
+---
+
+# gcp
+
+The `gcp` connection can be used to access Google Cloud Platform resources.
+
+```hcl
+connection "gcp" "gcp_def" {
+  connections = "~/.config/gcloud/my_connections.json"
+}
+```
+
+## Arguments
+
+| Name          | Type   | Required? | Description                                                                                                                                          |
+| ------------- | ------ | --------- | ---------------------------------------------------------------------------------------------------------------------------------------------------- |
+| `connections` | String | Optional  | Either the path to a JSON connection file that contains Google application connections or the contents of a service account key file in JSON format. |
+| `ttl`         | Number | Optional  | The time, in seconds, to cache the connections. By default, the GP connection will be cached for 5 minutes.                                          |
+
+All arguments are optional, and a `gcp` connection with no arguments will behave the same as the [GCP default connection](#default-connection).
+
+## Attributes (Read-Only)
+
+| Attribute      | Type   | Description                                          |
+| -------------- | ------ | ---------------------------------------------------- |
+| `access_token` | String | An OAuth access token to use to authenticate to GCP. |
+
+## Default Connection
+
+The GCP connection type includes an implicit, default connection (`connection.gcp.default`) that will be configured using the same mechanism as the GCloud CLI (environment variables, config files, etc); the effective connections of this default are the same as if you run the `gcloud` command. Connections will be loaded from:
+
+- The path specified in the `GOOGLE_APPLICATION_CONNECTIONS` environment variable, if set; otherwise
+- The standard location (`~/.config/gcloud/application_default_connections.json`)
+
+## Examples
+
+### Static Connections from Connection File
+
+```hcl
+connection "gcp" "gcp_def" {
+  connections = "~/.config/gcloud/my_connections.json"
+}
+```
+
+### Static Connections defined inline
+
+```hcl
+connection "gcp_inline" {
+  #project = "my_project"
+  connections = <<EOC
+  {
+  "client_id": "blah-blah.apps.googleusercontent.com",
+  "client_secret": "d-blah",
+  "quota_project_id": "dev-aaa",
+  "refresh_token": "1//blah-blah",
+  "type": "authorized_user"
+  }
+  EOC
+}
+```
+
+### Using GCP Connections in Container Step
+
+<!-- NOTE: Waiting on confirmation -->
+
+```hcl
+pipeline "gcp_test" {
+    param "cred" {
+    type    = string
+    default = "default"
+  }
+
+  step "container" "get_instances" {
+    image = "gcr.io/google.com/cloudsdktool/google-cloud-cli"
+    cmd   = ["gcloud", "compute", "instances", "list"]
+    env = {
+      CLOUDSDK_CORE_PROJECT      = "my-project"
+      CLOUDSDK_AUTH_ACCESS_TOKEN = connections.gcp[param.cred].access_token
+    }
+  }
+}
+```
+
+### Using GCP Connections in HTTP Step
+
+<!-- NOTE: Waiting on confirmation -->
+
+```hcl
+pipeline "gcp_test" {
+  param "cred" {
+    type    = string
+    default = "default"
+  }
+
+  step "http" "get_instances" {
+    url = "https://compute.googleapis.com/compute/v1/projects/my-project/aggregated/instances"
+
+    request_headers = {
+      Content-Type = "application/json; charset=utf-8"
+      Authorization = "Bearer ${connections.gcp[param.cred].access_token}"
+    }
+  }
+}
+```