Add examples of templated pipelines

Signed-off-by: Taylor Silva <tsilva@pivotal.io>

pipelines/templates/multiple-files/README.md

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+This pipeline has been split over multiple files. This is an example so the only resource used is the [mock resource](https://github.com/concourse/mock-resource).
+
+Render the template using [ytt](https://github.com/vmware-tanzu/carvel-ytt/releases) and running the following command inside this directory:
+
+```
+ytt -f ./
+```

pipelines/templates/multiple-files/jobs.lib.yml

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+#@ def unit_tests():
+name: unit-tests
+plan:
+- get: repo
+  trigger: true
+- task: run-unit-tests
+  config:
+    platform: linux
+    image_resource:
+      type: mock
+      source:
+        mirror_self: true
+    inputs:
+    - name: repo
+    run:
+      path: sh
+      args:
+      - -c
+      - |
+        echo running the unit tests...
+        cat repo/branch.txt
+        sleep 4
+        echo tests passed!
+#@ end
+
+#@ def build_rc_image():
+name: build-image
+plan:
+- get: repo
+  trigger: true
+  passed: [unit-tests]
+- task: build-image
+  config:
+    platform: linux
+    image_resource:
+      type: mock
+      source:
+        mirror_self: true
+    inputs:
+    - name: repo
+    outputs:
+    - name: image
+    run:
+      path: sh
+      args:
+      - -c
+      - |
+        echo building the image...
+        date +%Y-%m-%d > image/version
+        sleep 2
+        echo image built!
+- put: image-rc
+  params:
+    file: image/version
+#@ end
+
+#@ def deploy(deployment_env):
+name: #@ "deploy-" + deployment_env
+plan:
+- in_parallel:
+  - get: repo
+    passed:
+    #@ if deployment_env == "dev":
+    - build-image
+    #@ elif deployment_env == "prod":
+    - deploy-dev
+    #@ end
+  - get: image-rc
+    passed:
+    #@ if deployment_env == "dev":
+    - build-image
+    #@ elif deployment_env == "prod":
+    - deploy-dev
+    #@ end
+- put: #@ deployment_env + "-env"
+  params:
+    file: image-rc/oci_image
+#@ end

pipelines/templates/multiple-files/resources.lib.yml

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+#@ def resources(branch_name, artifact_slug):
+- name: repo
+  icon: git
+  type: mock
+  source:
+    initial_version: #@ "repo-at-" + branch_name
+    create_files:
+      branch.txt: #@ branch_name
+
+- name: image-rc
+  icon: oci
+  type: mock
+  source:
+    initial_version: #@ artifact_slug + "-rc"
+    create_files:
+      oci_image: #@ artifact_slug + "-rc"
+
+- name: dev-env
+  icon: wrench
+  type: mock
+
+- name: prod-env
+  icon: cloud-check
+  type: mock
+#@ end

pipelines/templates/multiple-files/template.yml

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+#@ load("@ytt:data", "data")
+#@ load("jobs.lib.yml", "unit_tests", "build_rc_image", "deploy")
+#@ load("resources.lib.yml", "resources")
+
+jobs:
+- #@ unit_tests()
+- #@ build_rc_image()
+- #@ deploy("dev")
+- #@ deploy("prod")
+
+resources: #@ resources(data.values.branch_name, data.values.artifact_slug)
+
+#! TODO: temp fix to ensure usage of the latest mock resource
+resource_types:
+- name: mock
+  type: registry-image
+  source:
+    repository: concourse/mock-resource
+

pipelines/templates/multiple-files/vars.yml

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+#@data/values
+---
+branch_name: "feature-1024"
+artifact_slug: "ft1024"

pipelines/templates/simple/README.md

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+To render the template download [ytt](https://github.com/vmware-tanzu/carvel-ytt/releases) and run `ytt -f pipeline.yml -f vars.yml > rendered.yml`. `rendered.yml` can then be passed to `fly set-pipeline` or a `set_pipeline` step to set the pipeline.

pipelines/templates/simple/template.yml

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+#@ load("@ytt:data", "data")
+jobs:
+- name: #@ data.values.job_name + "-job"
+  plan:
+  - task: #@ data.values.task_name
+    config:
+      platform: linux
+      image_resource:
+        type: mock
+        source: mirror_self: true
+      run:
+        path: echo
+        args: #@ data.values.args

pipelines/templates/simple/vars.yml

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+#@data/values
+---
+job_name: "hello-world"
+task_name: "hello-task"
+args:
+  - "hello world of vars!"