Parse backend options in backend (#3227)

Currently, backend options are parsed in the yaml parser.
This has some issues:
- backend specific code should be in the backend folders
- it is not possible to add backend options for backends added via
addons

pipeline/backend/kubernetes/backend_options.go

@@ -0,0 +1,77 @@
+package kubernetes
+
+import (
+	"github.com/mitchellh/mapstructure"
+
+	backend "go.woodpecker-ci.org/woodpecker/v2/pipeline/backend/types"
+)
+
+// BackendOptions defines all the advanced options for the kubernetes backend
+type BackendOptions struct {
+	Resources          Resources         `mapstructure:"resources"`
+	ServiceAccountName string            `mapstructure:"serviceAccountName"`
+	NodeSelector       map[string]string `mapstructure:"nodeSelector"`
+	Tolerations        []Toleration      `mapstructure:"tolerations"`
+	SecurityContext    *SecurityContext  `mapstructure:"securityContext"`
+}
+
+// Resources defines two maps for kubernetes resource definitions
+type Resources struct {
+	Requests map[string]string `mapstructure:"requests"`
+	Limits   map[string]string `mapstructure:"limits"`
+}
+
+// Toleration defines Kubernetes toleration
+type Toleration struct {
+	Key               string             `mapstructure:"key"`
+	Operator          TolerationOperator `mapstructure:"operator"`
+	Value             string             `mapstructure:"value"`
+	Effect            TaintEffect        `mapstructure:"effect"`
+	TolerationSeconds *int64             `mapstructure:"tolerationSeconds"`
+}
+
+type TaintEffect string
+
+const (
+	TaintEffectNoSchedule       TaintEffect = "NoSchedule"
+	TaintEffectPreferNoSchedule TaintEffect = "PreferNoSchedule"
+	TaintEffectNoExecute        TaintEffect = "NoExecute"
+)
+
+type TolerationOperator string
+
+const (
+	TolerationOpExists TolerationOperator = "Exists"
+	TolerationOpEqual  TolerationOperator = "Equal"
+)
+
+type SecurityContext struct {
+	Privileged      *bool       `mapstructure:"privileged"`
+	RunAsNonRoot    *bool       `mapstructure:"runAsNonRoot"`
+	RunAsUser       *int64      `mapstructure:"runAsUser"`
+	RunAsGroup      *int64      `mapstructure:"runAsGroup"`
+	FSGroup         *int64      `mapstructure:"fsGroup"`
+	SeccompProfile  *SecProfile `mapstructure:"seccompProfile"`
+	ApparmorProfile *SecProfile `mapstructure:"apparmorProfile"`
+}
+
+type SecProfile struct {
+	Type             SecProfileType `mapstructure:"type"`
+	LocalhostProfile string         `mapstructure:"localhostProfile"`
+}
+
+type SecProfileType string
+
+const (
+	SecProfileTypeRuntimeDefault SecProfileType = "RuntimeDefault"
+	SecProfileTypeLocalhost      SecProfileType = "Localhost"
+)
+
+func parseBackendOptions(step *backend.Step) (BackendOptions, error) {
+	var result BackendOptions
+	if step.BackendOptions == nil {
+		return result, nil
+	}
+	err := mapstructure.Decode(step.BackendOptions[EngineName], &result)
+	return result, err
+}