Feature/22 test handling incoming events (#30)

* Checkpoint before the weekend

* Update location for SetupPostgresDB

* Include first functioning tests for processing head

* Fix gitignore

* Test CaptureHead | Add Metrics | Handle Test Race Conditions

This Commit allows us to:

* Test the `CaptureHead` function.
* Test parsing a single Head message.
* Test a Reorg condition.
* Add Metrics. This is primarily used for testing but can have future use cases.
* Rearrange the test due to race conditions introduced by reusing a variable. `BeforeEach` can't be used to update `BC`.

* Update and finalize testing at this stage

* Update code and CI/CD

* Fix lint errors

* Update CICD and fail when file not found.

* Update test to have failed as expected.

pkg/database/sql/postgres/pgx_test.go

@@ -29,17 +29,18 @@ var _ = Describe("Pgx", func() {
 				_, err := postgres.NewPostgresDB(postgres.Config{
 					Driver: "PGX",
 				})
-				Expect(err).NotTo(BeNil())
+				Expect(err).To(HaveOccurred())
 
 				present, err := doesContainsSubstring(err.Error(), sql.DbConnectionFailedMsg)
 				Expect(present).To(BeTrue())
+				Expect(err).NotTo(HaveOccurred())
 			})
 		})
 		Context("The connection is successful", func() {
 			It("Should create a DB object", func() {
 				db, err := postgres.NewPostgresDB(postgres.DefaultConfig)
-				defer db.Close()
 				Expect(err).To(BeNil())
+				defer db.Close()
 			})
 		})
 	})