Have build script modify .env file

.github/workflows/build_and_test.yml

@@ -16,8 +16,6 @@ jobs:
 
     steps:
     - uses: actions/checkout@v2
-    - name: Set env
-      run: echo "DATABASE_URL=sqlite:./cache/metadata.sqlite" >> $GITHUB_ENV
     - name: Build
       run: cargo build --verbose
     - name: Run tests

build.rs

@@ -1,5 +1,7 @@
-use std::error::Error;
+use std::path::PathBuf;
 use std::process::Command;
+use std::str::FromStr;
+use std::{error::Error, io::Write};
 
 use vergen::{vergen, Config, ShaKind};
 
@@ -21,5 +23,21 @@ fn main() -> Result<(), Box<dyn Error>> {
         .current_dir(&project_root)
         .output()?;
 
+    let env_var_regex = "^DATABASE_URL=sqlite:./cache/metadata.sqlite$";
+    if !Command::new("grep")
+        .args([env_var_regex, ".env"])
+        .current_dir(&project_root)
+        .output()?
+        .status
+        .success()
+    {
+        let mut path = PathBuf::from_str(&project_root)?;
+        path.push(".env");
+
+        let mut file = std::fs::OpenOptions::new().append(true).open(path)?;
+        file.write_all(b"\nDATABASE_URL=sqlite:./cache/metadata.sqlite\n")?;
+        file.sync_all()?;
+    }
+
     Ok(())
 }