container credentials (#868)

* Chore: add a snapshot target

* Update: support credentials for private containers

Resolves: #788

* fix: rework container credentials

Signed-off-by: hackercat <me@hackerc.at>

* fix: check if Credentials are not nil

* fix: return on missing credentials key

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

act/model/workflow.go

@@ -295,15 +295,16 @@ func commonKeysMatch(a map[string]interface{}, b map[string]interface{}) bool {
 
 // ContainerSpec is the specification of the container to use for the job
 type ContainerSpec struct {
-	Image      string            `yaml:"image"`
-	Env        map[string]string `yaml:"env"`
-	Ports      []string          `yaml:"ports"`
-	Volumes    []string          `yaml:"volumes"`
-	Options    string            `yaml:"options"`
-	Entrypoint string
-	Args       string
-	Name       string
-	Reuse      bool
+	Image       string            `yaml:"image"`
+	Env         map[string]string `yaml:"env"`
+	Ports       []string          `yaml:"ports"`
+	Volumes     []string          `yaml:"volumes"`
+	Options     string            `yaml:"options"`
+	Credentials map[string]string `yaml:"credentials"`
+	Entrypoint  string
+	Args        string
+	Name        string
+	Reuse       bool
 }
 
 // Step is the structure of one step in a job