Create metadata (#133)

* Added migration for metadata table used to store a song's metadata

* Added comment for new table

* Added endpoint to create metadata

* Filling out code

* Changed type of duration in request

* Reorganizing code

* Changing metadata table to song

* Added TODO for data type discrepancy for the future

* Fix migration syntax error

* Added types to request

* Added environment variable for root directory:

* Moving keys to its own module

* Moved environement related code to its own module

* Added function to get root_directory

* Added endpoint to create song

* Minor fixes

* Added test and refactored tests

* Ironing out some kinks

* Resolved test issue

Turns out I was using the wrong id value

* Added env variable in workflow

* Added TODO

* Updated env variable

* clippy warning fixes

* Making sure date_created is populated when returneD

* Code cleanup

* Added TODOs

* Uncommenting tests

* Code formatting

src/environment.rs

@@ -0,0 +1,9 @@
+pub async fn get_db_url() -> String {
+    dotenvy::dotenv().ok();
+    std::env::var(crate::keys::DBURL).expect(crate::keys::error::ERROR)
+}
+
+pub async fn get_root_directory() -> Result<String, std::env::VarError> {
+    dotenvy::dotenv().ok();
+    std::env::var(crate::keys::ROOT_DIRECTORY)
+}