Update steps version to 0.2.0

Steps v0.2.0 was released recently, and made some backward-incompatible
breaking changes. Because of the way the
registry.gitlab.com/gitlab-org/step-runner:v0 image is released (the
same v0 tag is reused for all releases), the steps integration
integration tests started failing with:

    ERROR: Job failed (system failure): container exec on "6b6d4cefa3ed71e4f97254736db4c05ff815032ae00fb9585688099c6235ab70" finished with: executing step request: running run request for job "0": rpc error: code = Unknown desc = loading step: reading steps "{}\n---\nsteps:\n- name: echo\n  script: echo ${{ env.FLIN_FLAN_FLON }}\n": validating step: jsonschema: '' does not validate with https://gitlab.com/gitlab-org/step-runner/schema/v1/step#/$ref/oneOf/0/required: missing properties: 'name', 'step'
This is because we're using a 0.1.0 version of the library, but a 0.2.0
of the binary (included in the above image)

Elsewhere I have made these tests to be skipped by setting the
CI_SKIP_STEPS_TESTS variable, but to fix this we have to upgrade to
v0.2.0 of the steps library.

With the 0.2.0 release, the step
https://gitlab.com/gitlab-org/ci-cd/runner-tools/echo-step was also
changed, and since we use that step in the test, we have to also update
the version we use to `@v4` from `@v3`.

I'll remove the CI_SKIP_STEPS_TESTS variable when this MR is merged.

Author: Axel von Bertoldi

executors/docker/docker_steps_integration_test.go

@@ -45,7 +45,7 @@ func Test_StepsIntegration(t *testing.T) {
 		},
 		"remote step": {
 			steps: `- name: echo
-  step: "https://gitlab.com/gitlab-org/ci-cd/runner-tools/echo-step@v3"
+  step: "https://gitlab.com/gitlab-org/ci-cd/runner-tools/echo-step@v4"
   inputs:
     echo: foo bar baz`,
 			wantOut: []string{"foo bar baz"},

steps/steps.go

@@ -55,7 +55,7 @@ const stepsPreamble = "{}\n---\n"
 func addStepsPreamble(jsonSteps string) (string, error) {
 	stepSchema := &schema.Step{}
 
-	err := json.Unmarshal([]byte(jsonSteps), &stepSchema.Steps)
+	err := json.Unmarshal([]byte(jsonSteps), &stepSchema.Run)
 	if err != nil {
 		return "", fmt.Errorf("unmarshalling steps %q: %w", jsonSteps, err)
 	}

steps/steps_test.go

@@ -16,23 +16,23 @@ func Test_addStepsPreamble(t *testing.T) {
 	}{
 		"simple script": {
 			in:   `[{"name":"script", "script": "foo bar baz"}]`,
-			want: "{}\n---\nsteps:\n- name: script\n  script: foo bar baz\n",
+			want: "{}\n---\nrun:\n- name: script\n  script: foo bar baz\n",
 		},
 		"reference local step": {
 			in:   `[{"name":"local", "step":"./some/step", "inputs":{"in":"bar"}}]`,
-			want: "{}\n---\nsteps:\n- inputs:\n    in: bar\n  name: local\n  step: ./some/step\n",
+			want: "{}\n---\nrun:\n- inputs:\n    in: bar\n  name: local\n  step: ./some/step\n",
 		},
 		"reference remote step": {
 			in:   `[{"name":"remote", "step":"https://gitlab.com/components/script@v1", "inputs":{"in":"bar"}}]`,
-			want: "{}\n---\nsteps:\n- inputs:\n    in: bar\n  name: remote\n  step: https://gitlab.com/components/script@v1\n",
+			want: "{}\n---\nrun:\n- inputs:\n    in: bar\n  name: remote\n  step: https://gitlab.com/components/script@v1\n",
 		},
 		"action step": {
 			in:   `[{"name":"action", "action":"some-action@v1", "inputs":{"in":"bar"}}]`,
-			want: "{}\n---\nsteps:\n- action: some-action@v1\n  inputs:\n    in: bar\n  name: action\n",
+			want: "{}\n---\nrun:\n- action: some-action@v1\n  inputs:\n    in: bar\n  name: action\n",
 		},
 		"exec step": {
 			in:   `[{"name":"exec", "exec":{"command":["cmd","arg1", "arg2"],"work_dir":"/foo/bar/baz"}, "inputs":{"in":"bar"}}]`,
-			want: "{}\n---\nsteps:\n- exec:\n    command:\n    - cmd\n    - arg1\n    - arg2\n    work_dir: /foo/bar/baz\n  inputs:\n    in: bar\n  name: exec\n",
+			want: "{}\n---\nrun:\n- exec:\n    command:\n    - cmd\n    - arg1\n    - arg2\n    work_dir: /foo/bar/baz\n  inputs:\n    in: bar\n  name: exec\n",
 		},
 	}