feat: Add shared Helm cache, based on flock (#196)

README.md

@@ -66,7 +66,8 @@ docker pull ghcr.io/doodlescheduling/flux-build:v2
 | `--workers`  | `WORKERS`  | `Number of CPU cores` | Workers used to template the HelmReleases. Greatly improves speed if there are many HelmReleases |
 | `--fail-fast`  | `FAIL_FAST` | `false` | Exit early if an error occured |
 | `--allow-failure`  | `ALLOW_FAILURE` | `false` | Do not exit > 0 if an error occured |
-| `--cache-enabled`  | `CACHE_ENABLED`  | `true` | Enable Helm charts cache |
+| `--cache`  | `CACHE`  | `inmemory` | Type of Helm charts cache to use, options: `none`, `inmemory`, `fs`|
+| `--cache-dir`  | `CACHE_DIR`  | `` | Directory for `fs` Helm charts cache |
 | `--api-versions` | `API_VERSIONS` | `` | Kubernetes api versions used for Capabilities.APIVersions (See helm help) |
 | `--kube-version`  | `KUBE_VERSION` | `1.27.0` | Kubernetes version (Some helm charts validate manifests against a specific kubernetes version) |
 | `--output`  | `OUTPUT` | `/dev/stdout` | Path to output file |

internal/action/action.go

@@ -6,6 +6,7 @@ import (
 	"os"
 
 	"github.com/doodlescheduling/flux-build/internal/build"
+	"github.com/doodlescheduling/flux-build/internal/cachemgr"
 	"github.com/doodlescheduling/flux-build/internal/worker"
 	helmv1 "github.com/fluxcd/helm-controller/api/v2beta1"
 	"github.com/go-logr/logr"
@@ -18,8 +19,7 @@ type Action struct {
 	AllowFailure     bool
 	FailFast         bool
 	Workers          int
-	CacheDir         string
-	CacheEnabled     bool
+	Cache            *cachemgr.Cache
 	Paths            []string
 	APIVersions      []string
 	IncludeHelmHooks bool
@@ -65,7 +65,7 @@ func (a *Action) Run(ctx context.Context) error {
 		APIVersions:      a.APIVersions,
 		KubeVersion:      a.KubeVersion,
 		IncludeHelmHooks: a.IncludeHelmHooks,
-		CacheEnabled:     a.CacheEnabled,
+		Cache:            a.Cache,
 	})
 
 	helmResultPool.Push(worker.Task(func(ctx context.Context) error {