Add example that uses stepTemplate 🐾

There weren't any "yaml tests" aka examples that used the stepTemplate
so after I renamed `stepTemplate` from `containerTemplate` it was not
100% clear if this worked. Also it's helpful to provide examples to
users to see it in action :)

examples/taskruns/task-env.yaml

@@ -4,47 +4,56 @@ kind: Task
 metadata:
  name: task-env-merge
 spec:
+ # This template will be applied to all steps
+ stepTemplate:
+ env:
+ - name: QUX
+ value: original
  inputs:
  params:
- - name: FOO
- description: FOO variable
- - name: BAR
- description: BAR variable
- - name: FOOBAR
- description: FOODBAR variable
- default: foobar
+  - name: FOO
+  description: FOO variable
+  - name: BAR
+  description: BAR variable
+  - name: FOOBAR
+  description: FOODBAR variable
+  default: foobar
  steps:
- # Test the environment variables are set in the task
- # using this template
- - name: foo
- image: ubuntu
- command: ['bash']
- args: ['-c', '[[ ${FOO} == "foo" ]]']
- env:
- - name: FOO
- value: ${inputs.params.FOO}
- - name: foobar
- image: ubuntu
- command: ['bash']
- args: ['-c', '[[ ${FOOBAR} == "foobar" ]]']
- env:
- - name: FOOBAR
- value: ${inputs.params.FOOBAR}
- - name: bar
- image: ubuntu
- command: ['bash']
- args: ['-c', '[[ ${BAR} == "bar" ]]']
- env:
- - name: BAR
- value: ${inputs.params.BAR}
- # Use the taskrun's declared env value, overriding the template's
- - name: foo-override
- image: ubuntu
- command: ['bash']
- args: ['-c', '[[ ${FOO} == "bazzzzz" ]]']
- env:
- - name: FOO
- value: bazzzzz
+ # Test the environment variables are set in the task
+ - name: foo
+ image: ubuntu
+ command: ["bash"]
+ args: ["-c", '[[ ${FOO} == "foo" ]]']
+ env:
+ - name: FOO
+ value: ${inputs.params.FOO}
+ - name: foobar
+ image: ubuntu
+ command: ["bash"]
+ args: ["-c", '[[ ${FOOBAR} == "foobar" ]]']
+ env:
+ - name: FOOBAR
+ value: ${inputs.params.FOOBAR}
+ - name: bar
+ image: ubuntu
+ command: ["bash"]
+ args: ["-c", '[[ ${BAR} == "bar" ]]']
+ env:
+ - name: BAR
+ value: ${inputs.params.BAR}
+ # Use the env var from the stepTemplate
+ - name: qux-no-override
+ image: ubuntu
+ command: ["bash"]
+ args: ["-c", '[[ ${QUX} == "original" ]]']
+ # Override the env var in the stepTemplate
+ - name: qux-override
+ image: ubuntu
+ command: ["bash"]
+ args: ["-c", '[[ ${QUX} == "override" ]]']
+ env:
+ - name: QUX
+ value: override
 ---
 apiVersion: tekton.dev/v1alpha1
 kind: TaskRun
@@ -53,9 +62,9 @@ metadata:
 spec:
  inputs:
  params:
- - name: FOO
- value: foo
- - name: BAR
- value: bar
+  - name: FOO
+  value: foo
+  - name: BAR
+  value: bar
  taskRef:
  name: task-env-merge