add devcontainer

.devcontainer/Dockerfile

@@ -0,0 +1,2 @@
+FROM mcr.microsoft.com/devcontainers/go:1.3.0-1.23-bookworm
+RUN apt-get update && apt-get upgrade -y

.devcontainer/devcontainer.json

@@ -0,0 +1,10 @@
+// For format details, see https://aka.ms/devcontainer.json. For config options, see the
+// README at: https://github.com/devcontainers/templates/tree/main/src/go
+{
+	"name": "Go",
+	// Or use a Dockerfile or Docker Compose file. More info: https://containers.dev/guide/dockerfile
+	"dockerComposeFile": "docker-compose.yml",
+    "service": "devcontainer",
+    "workspaceFolder": "/workspaces/${localWorkspaceFolderBasename}"
+}
+

.devcontainer/docker-compose.yml

@@ -0,0 +1,28 @@
+version: '3.8'
+services:
+  devcontainer:
+    build: 
+      context: .
+      dockerfile: Dockerfile
+    volumes:
+      - ../..:/workspaces:cached      
+    network_mode: service:minio
+    command: sleep infinity
+    environment:
+      AWS_ACCESS_KEY_ID: ocfltest
+      AWS_SECRET_ACCESS_KEY: ocfltest
+      AWS_REGION: us-east-1
+      OCFL_TEST_S3: "http://minio:9000"
+
+  minio:
+    image: quay.io/minio/minio:RELEASE.2024-09-22T00-33-43Z
+    restart: unless-stopped
+    volumes:
+      - minio-data:/data
+    command: server /data
+    environment:
+      MINIO_ROOT_USER: ocfltest
+      MINIO_ROOT_PASSWORD: ocfltest
+
+volumes:
+  minio-data:

.github/dependabot.yml

@@ -0,0 +1,12 @@
+# To get started with Dependabot version updates, you'll need to specify which
+# package ecosystems to update and where the package manifests are located.
+# Please see the documentation for more information:
+# https://docs.github.com/github/administering-a-repository/configuration-options-for-dependency-updates
+# https://containers.dev/guide/dependabot
+
+version: 2
+updates:
+ - package-ecosystem: "devcontainers"
+   directory: "/"
+   schedule:
+     interval: weekly

cmd/ocfl/internal/testutil/s3.go

@@ -48,7 +48,7 @@ func TempS3Location(t *testing.T, prefix string) string {
 func S3Client(ctx context.Context) (*s3.Client, error) {
 	endpoint := os.Getenv(envS3Endpoint)
 	if endpoint == "" {
-		return nil, errors.New("S3 not enabled in thest test environment: $OCFL_TEST_S3ß not set.")
+		return nil, errors.New("S3 not enabled in thest test environment: $OCFL_TEST_S3 not set")
 	}
 	cnf, err := config.LoadDefaultConfig(ctx)
 	if err != nil {