Add SAM deploy template for shared layer

.gitignore

@@ -1,6 +1,8 @@
+.aws-sam/
 .idea/
 coverage
 node_modules/
 dist/
 *.iml
 .DS_Store
+samconfig.toml

template.yml

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+AWSTemplateFormatVersion: '2010-09-09'
+Transform: 'AWS::Serverless-2016-10-31'
+Resources:
+  SharedLayer:
+    Type: AWS::Serverless::LayerVersion
+    Properties:
+      LayerName: libvips-sharp-jp2
+      ContentUri: dist/sharp-lambda-layer.zip
+      CompatibleArchitectures:
+        - x86_64
+      CompatibleRuntimes:
+        - nodejs14.x
+        - nodejs16.x
+        - nodejs18.x
+      LicenseInfo: Apache-2.0
+  LayerPermission:
+    Type: AWS::Lambda::LayerVersionPermission
+    Properties: 
+      Action: lambda:GetLayerVersion
+      LayerVersionArn: !Ref SharedLayer
+      Principal: "*"
+Outputs:
+  LayerArn:
+    Value: !Ref SharedLayer