Revert Ruby 2.7.0 upgrade for now.

.ruby-version

@@ -1 +1 @@
-2.7.0
+2.6.5

Gemfile

@@ -1,5 +1,5 @@
 source "https://rubygems.org"
-ruby "~> 2.7.0"
+ruby "~> 2.6.5"
 
 gem "rails"
 gem "active_model_serializers"

Gemfile.lock

@@ -119,7 +119,7 @@ GEM
       railties (>= 3.2, < 6.1)
     globalid (0.4.2)
       activesupport (>= 4.2.0)
-    google-api-client (0.36.3)
+    google-api-client (0.36.4)
       addressable (~> 2.5, >= 2.5.1)
       googleauth (~> 0.9)
       httpclient (>= 2.8.1, < 3.0)
@@ -131,7 +131,7 @@ GEM
       google-cloud-env (~> 1.0)
     google-cloud-env (1.3.0)
       faraday (~> 0.11)
-    google-cloud-storage (1.25.0)
+    google-cloud-storage (1.25.1)
       addressable (~> 2.5)
       digest-crc (~> 0.4)
       google-api-client (~> 0.33)
@@ -184,7 +184,7 @@ GEM
       method_source (~> 0.9.0)
     pry-rails (0.3.9)
       pry (>= 0.10.4)
-    public_suffix (4.0.2)
+    public_suffix (4.0.3)
     rabbitmq_http_api_client (1.12.0)
       faraday (~> 0.15.4)
       faraday_middleware (~> 0.13.0)
@@ -341,7 +341,7 @@ DEPENDENCIES
   valid_url
 
 RUBY VERSION
-   ruby 2.7.0p0
+   ruby 2.6.5p114
 
 BUNDLED WITH
    2.1.3

docker_configs/api.Dockerfile

@@ -1,4 +1,4 @@
-FROM ruby:2.7.0
+FROM ruby:2.6.5
 RUN wget -q https://www.postgresql.org/media/keys/ACCC4CF8.asc -O - | apt-key add - && \
   sh -c 'VERSION_CODENAME=stretch; . /etc/os-release; echo "deb http://apt.postgresql.org/pub/repos/apt/ $VERSION_CODENAME-pgdg main" >> /etc/apt/sources.list.d/pgdg.list' && \
   apt-get update -qq && apt-get install -y build-essential libpq-dev postgresql postgresql-contrib && \