feat(env): support env vars for services (both run command and compose)

pkg/api/service.go

@@ -107,7 +107,9 @@ type ContainerSpec struct {
 	Command []string
 	// Entrypoint overrides the default ENTRYPOINT of the image.
 	Entrypoint []string
-	Image      string
+	// Env defines the environment variables to set inside the container.
+	Env   EnvVars
+	Image string
 	// Run a custom init inside the container. If nil, use the daemon's configured settings.
 	Init *bool
 	// PullPolicy determines when to pull the image from the registry or use the image already available in the cluster.
@@ -164,6 +166,20 @@ func (s *ContainerSpec) Clone() ContainerSpec {
 	return spec
 }
 
+type EnvVars map[string]string
+
+// ToSlice converts the environment variables to a slice of strings in the format "key=value".
+func (e EnvVars) ToSlice() []string {
+	env := make([]string, 0, len(e))
+	for k, v := range e {
+		if k == "" {
+			continue
+		}
+		env = append(env, fmt.Sprintf("%s=%s", k, v))
+	}
+	return env
+}
+
 type Service struct {
 	ID         string
 	Name       string

pkg/client/compose/deploy.go

@@ -4,6 +4,7 @@ import (
 	"context"
 	"errors"
 	"fmt"
+
 	"github.com/compose-spec/compose-go/v2/graph"
 	"github.com/compose-spec/compose-go/v2/types"
 	"github.com/psviderski/uncloud/pkg/api"
@@ -31,7 +32,6 @@ func NewDeployment(ctx context.Context, cli Client, project *types.Project) (*De
 	resolver := &deploy.ServiceSpecResolver{
 		// If the domain is not found (not reserved), an empty domain is used for the resolver.
 		ClusterDomain: domain,
-		// TODO: provide an image resolver.
 	}
 
 	return &Deployment{

pkg/client/compose/service.go

@@ -2,6 +2,7 @@ package compose
 
 import (
 	"fmt"
+
 	"github.com/compose-spec/compose-go/v2/types"
 	"github.com/psviderski/uncloud/pkg/api"
 )
@@ -19,13 +20,23 @@ func ServiceSpecFromCompose(name string, service types.ServiceConfig) (api.Servi
 		return api.ServiceSpec{}, fmt.Errorf("unsupported pull policy: '%s'", service.PullPolicy)
 	}
 
+	env := make(map[string]string, len(service.Environment))
+	for k, v := range service.Environment {
+		if v == nil {
+			// nil value means the variable misses a value in the compose file, and it hasn't been resolved
+			// to a variable from the local environment running this code.
+			continue
+		}
+		env[k] = *v
+	}
+
 	spec := api.ServiceSpec{
 		Container: api.ContainerSpec{
 			Command:    service.Command,
+			Env:        env,
 			Image:      service.Image,
 			Init:       service.Init,
 			PullPolicy: pullPolicy,
-			// TODO: env
 			// TODO: volumes
 		},
 		Name: name,