add example

Author: Stasik-Mom

examples/entities.yaml

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+---
+# https://backstage.io/docs/features/software-catalog/descriptor-format#kind-system
+apiVersion: backstage.io/v1alpha1
+kind: System
+metadata:
+  name: examples
+spec:
+  owner: guests
+---
+# https://backstage.io/docs/features/software-catalog/descriptor-format#kind-component
+apiVersion: backstage.io/v1alpha1
+kind: Component
+metadata:
+  name: example-website
+spec:
+  type: website
+  lifecycle: experimental
+  owner: guests
+  system: examples
+  providesApis: [example-grpc-api]
+---
+# https://backstage.io/docs/features/software-catalog/descriptor-format#kind-api
+apiVersion: backstage.io/v1alpha1
+kind: API
+metadata:
+  name: example-grpc-api
+spec:
+  type: grpc
+  lifecycle: experimental
+  owner: guests
+  system: examples
+  definition: |
+    syntax = "proto3";
+
+    service Exampler {
+      rpc Example (ExampleMessage) returns (ExampleMessage) {};
+    }
+
+    message ExampleMessage {
+      string example = 1;
+    };

examples/org.yaml

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+---
+# https://backstage.io/docs/features/software-catalog/descriptor-format#kind-user
+apiVersion: backstage.io/v1alpha1
+kind: User
+metadata:
+  name: guest
+spec:
+  memberOf: [guests]
+---
+# https://backstage.io/docs/features/software-catalog/descriptor-format#kind-group
+apiVersion: backstage.io/v1alpha1
+kind: Group
+metadata:
+  name: guests
+spec:
+  type: team
+  children: []

examples/template/content/catalog-info.yaml

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+apiVersion: backstage.io/v1alpha1
+kind: Component
+metadata:
+  name: ${{ values.name | dump }}
+spec:
+  type: service
+  owner: user:guest
+  lifecycle: experimental

examples/template/content/index.js

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+console.log('Hello from ${{ values.name }}!');

examples/template/content/package.json

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+{
+  "name": "${{ values.name }}",
+  "private": true,
+  "dependencies": {}
+}

examples/template/template.yaml

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+apiVersion: scaffolder.backstage.io/v1beta3
+# https://backstage.io/docs/features/software-catalog/descriptor-format#kind-template
+kind: Template
+metadata:
+  name: example-nodejs-template
+  title: Example Node.js Template
+  description: An example template for the scaffolder that creates a simple Node.js service
+spec:
+  owner: user:guest
+  type: service
+
+  # These parameters are used to generate the input form in the frontend, and are
+  # used to gather input data for the execution of the template.
+  parameters:
+    - title: Fill in some steps
+      required:
+        - name
+      properties:
+        name:
+          title: Name
+          type: string
+          description: Unique name of the component
+          ui:autofocus: true
+          ui:options:
+            rows: 5
+    - title: Choose a location
+      required:
+        - repoUrl
+      properties:
+        repoUrl:
+          title: Repository Location
+          type: string
+          ui:field: RepoUrlPicker
+          ui:options:
+            allowedHosts:
+              - github.com
+
+  # These steps are executed in the scaffolder backend, using data that we gathered
+  # via the parameters above.
+  steps:
+    # Each step executes an action, in this case one templates files into the working directory.
+    - id: fetch-base
+      name: Fetch Base
+      action: fetch:template
+      input:
+        url: ./content
+        values:
+          name: ${{ parameters.name }}
+
+    # This step publishes the contents of the working directory to GitHub.
+    - id: publish
+      name: Publish
+      action: publish:github
+      input:
+        allowedHosts: ['github.com']
+        description: This is ${{ parameters.name }}
+        repoUrl: ${{ parameters.repoUrl }}
+
+    # The final step is to register our new component in the catalog.
+    - id: register
+      name: Register
+      action: catalog:register
+      input:
+        repoContentsUrl: ${{ steps['publish'].output.repoContentsUrl }}
+        catalogInfoPath: '/catalog-info.yaml'
+
+  # Outputs are displayed to the user after a successful execution of the template.
+  output:
+    links:
+      - title: Repository
+        url: ${{ steps['publish'].output.remoteUrl }}
+      - title: Open in catalog
+        icon: catalog
+        entityRef: ${{ steps['register'].output.entityRef }}