Use lambci/node-custom-lambda runtime

Since the standard Node 12 Lambda runtime doesn't work with Mapnik, use
a custom runtime from LambCI instead. They publish layers that you can
just add by ARN.

CHANGELOG.md

@@ -12,6 +12,7 @@ and this project adheres to [Semantic Versioning](http://semver.org/spec/v2.0.0.
 #### Changed
 - Add filter to Neighborhood List
 - Remove filters for created_by, modified_by and fips_code for matching an AnalysisJob to existing Neighborhood records
+- Upgrade Tilegarden Lambda runtime to Node 12
 
 #### Added
 - S3 caching of Census data files

src/tilegarden/scripts/deploy

@@ -1,6 +1,8 @@
 #!/bin/bash
 
 yarn claudia update --config claudia/claudia.json --no-optional-dependencies \
+    --runtime "provided" \
+    --layers "arn:aws:lambda:${LAMBDA_REGION}:553035198032:layer:nodejs12:36" \
     ${LAMBDA_TIMEOUT:+--timeout ${LAMBDA_TIMEOUT}} \
     ${LAMBDA_MEMORY:+--memory ${LAMBDA_MEMORY}} \
     ${LAMBDA_SECURITY_GROUPS:+--security-group-ids ${LAMBDA_SECURITY_GROUPS}} \

src/tilegarden/scripts/deploy-new

@@ -1,6 +1,8 @@
 #!/bin/bash
 
 yarn claudia create --config claudia/claudia.json --no-optional-dependencies \
+    --runtime "provided" \
+    --layers "arn:aws:lambda:${LAMBDA_REGION}:553035198032:layer:nodejs12:36" \
     --api-module dist/api \
     --name ${LAMBDA_FUNCTION_NAME} \
     --region ${LAMBDA_REGION} \