Add schema deployment tests (#265)

* Add schema deployment tests

Updated flyway schema script files so that they reflect what is
currently deployed in alpha: ClaimsList and PremiumList related
elements.

Put post-schema-push pg_dump output in nomulus.golden.sql as the
authoritative schema. Also added test to verify that the schema
pushed by flyway will result in exactly the golden schema.

Upgraded testcontainers to 1.12.1.

Added a custom Truth subject for better diffing of multi-line
text blocks.

Removed claims_list.sql and premium_list.sql, as we do not have use for
them.

* Add schema deployment tests

Updated flyway schema script files so that they reflect what is
currently deployed in alpha: ClaimsList and PremiumList related
elements.

Put post-schema-push pg_dump output in nomulus.golden.sql as the
authoritative schema. Also added test to verify that the schema
pushed by flyway will result in exactly the golden schema.

Upgraded testcontainers to 1.12.1.

Added a custom Truth subject for better diffing of multi-line
text blocks.

Removed claims_list.sql and premium_list.sql, as we do not have use for
them.

* Add schema deployment tests

Updated flyway schema script files so that they reflect what is
currently deployed in alpha: ClaimsList and PremiumList related
elements.

Put post-schema-push pg_dump output in nomulus.golden.sql as the
authoritative schema. Also added test to verify that the schema
pushed by flyway will result in exactly the golden schema.

Upgraded testcontainers to 1.12.1.

Added a custom Truth subject for better diffing of multi-line
text blocks.

Removed claims_list.sql and premium_list.sql, as we do not have use for
them.

db/src/test/resources/google/registry/testing/text-diff-actual.txt

@@ -0,0 +1,2 @@
+This is a random file,
+with two lines and terminates with a newline.

db/src/test/resources/google/registry/testing/text-diff-expected.txt

@@ -0,0 +1,3 @@
+This is a random file,
+
+with three lines and terminates without a newline.

db/src/test/resources/google/registry/testing/text-sidebyside-diff.txt

@@ -0,0 +1,5 @@
+|Expected                                              |Actual                                               |
+|------------------------------------------------------|-----------------------------------------------------|
+|This is a random file,                                |This is a random file,                               |
+|                                                      |with **two** lines and terminates **with** a newline.|
+|with ~three~ lines and terminates ~without~ a newline.|                                                     |

db/src/test/resources/google/registry/testing/text-unified-diff.txt

@@ -0,0 +1,6 @@
+--- expected
++++ actual
+@@ -2,2 +2,1 @@
+-
+-with three lines and terminates without a newline.
++with two lines and terminates with a newline.

db/src/test/resources/testcontainer/mount/README.md

@@ -0,0 +1,4 @@
+## Summary
+
+This folder may be mapped to a testcontainer instance as a volume. Please refer
+to SchemaTest.java for context.