Minimal actix / sqlx with MUSL

1. Install musl-gcc:

• eg: sudo apt install musl-tools

2. Setup musl openssl:

• https://qiita.com/liubin/items/6c94f0b61f746c08b74c

3. Setup place mysql db link in .env
4. Create model table: eg:

   create table musl (demo varchar(255));

5. Install rustup target

   rustup target add x86_64-unknown-linux-musl

6. Build musl (ensure you have x86_64-unknown-linux-musl target):

   PKG_CONFIG_ALLOW_CROSS=1 OPENSSL_STATIC=true OPENSSL_DIR=/musl cargo build --target x86_64-unknown-linux-musl

   or with cargo make

   cargo make debug_musl

7. Verify linking:

   $ ldd target/x86_64-unknown-linux-musl/debug/musl_demo                                                                                  11:09:07
   statically linked