feat: allow to spawn and run a local reusable workflow (#1423)

* feat: allow to spawn and run a local reusable workflow

This change contains the ability to parse/plan/run a local
reusable workflow.
There are still numerous things missing:

- inputs
- secrets
- outputs

* feat: add workflow_call inputs

* test: improve inputs test

* feat: add input defaults

* feat: allow expressions in inputs

* feat: use context specific expression evaluator

* refactor: prepare for better re-usability

* feat: add secrets for reusable workflows

* test: use secrets during test run

* feat: handle reusable workflow outputs

Co-authored-by: mergify[bot] <37929162+mergify[bot]@users.noreply.github.com>

act/model/workflow.go

@@ -100,6 +100,44 @@ func (w *Workflow) WorkflowDispatchConfig() *WorkflowDispatch {
 	return &config
 }
 
+type WorkflowCallInput struct {
+	Description string `yaml:"description"`
+	Required    bool   `yaml:"required"`
+	Default     string `yaml:"default"`
+	Type        string `yaml:"type"`
+}
+
+type WorkflowCallOutput struct {
+	Description string `yaml:"description"`
+	Value       string `yaml:"value"`
+}
+
+type WorkflowCall struct {
+	Inputs  map[string]WorkflowCallInput  `yaml:"inputs"`
+	Outputs map[string]WorkflowCallOutput `yaml:"outputs"`
+}
+
+func (w *Workflow) WorkflowCallConfig() *WorkflowCall {
+	if w.RawOn.Kind != yaml.MappingNode {
+		return nil
+	}
+
+	var val map[string]yaml.Node
+	err := w.RawOn.Decode(&val)
+	if err != nil {
+		log.Fatal(err)
+	}
+
+	var config WorkflowCall
+	node := val["workflow_call"]
+	err = node.Decode(&config)
+	if err != nil {
+		log.Fatal(err)
+	}
+
+	return &config
+}
+
 // Job is the structure of one job in a workflow
 type Job struct {
 	Name           string                    `yaml:"name"`
@@ -115,6 +153,8 @@ type Job struct {
 	Defaults       Defaults                  `yaml:"defaults"`
 	Outputs        map[string]string         `yaml:"outputs"`
 	Uses           string                    `yaml:"uses"`
+	With           map[string]interface{}    `yaml:"with"`
+	RawSecrets     yaml.Node                 `yaml:"secrets"`
 	Result         string
 }
 
@@ -169,6 +209,34 @@ func (s Strategy) GetFailFast() bool {
 	return failFast
 }
 
+func (j *Job) InheritSecrets() bool {
+	if j.RawSecrets.Kind != yaml.ScalarNode {
+		return false
+	}
+
+	var val string
+	err := j.RawSecrets.Decode(&val)
+	if err != nil {
+		log.Fatal(err)
+	}
+
+	return val == "inherit"
+}
+
+func (j *Job) Secrets() map[string]string {
+	if j.RawSecrets.Kind != yaml.MappingNode {
+		return nil
+	}
+
+	var val map[string]string
+	err := j.RawSecrets.Decode(&val)
+	if err != nil {
+		log.Fatal(err)
+	}
+
+	return val
+}
+
 // Container details for the job
 func (j *Job) Container() *ContainerSpec {
 	var val *ContainerSpec