Interpolate environment variables in config file

[dotansimha]

Closes #149

[github-actions]

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[github-actions]

✅ Benchmark Results

     data_received..................: 212 MB  2.7 MB/s
     data_sent......................: 658 MB  8.2 MB/s
     http_req_blocked...............: avg=2.67µs  min=621ns    med=1.44µs  max=29.98ms p(90)=1.96µs  p(95)=2.19µs 
     http_req_connecting............: avg=530ns   min=0s       med=0s      max=29.93ms p(90)=0s      p(95)=0s     
   ✓ http_req_duration..............: avg=4.26ms  min=61.7µs   med=2.26ms  max=92.32ms p(90)=11.06ms p(95)=15.37ms
       { expected_response:true }...: avg=4.26ms  min=61.7µs   med=2.26ms  max=92.32ms p(90)=11.06ms p(95)=15.37ms
   ✓ http_req_failed................: 0.00%   ✓ 0            ✗ 1669574
     http_req_receiving.............: avg=40.56µs min=6.09µs   med=15.97µs max=55.34ms p(90)=22.78µs p(95)=75.09µs
     http_req_sending...............: avg=15.7µs  min=3.59µs   med=7.84µs  max=35.34ms p(90)=10.9µs  p(95)=14.95µs
     http_req_tls_handshaking.......: avg=0s      min=0s       med=0s      max=0s      p(90)=0s      p(95)=0s     
     http_req_waiting...............: avg=4.2ms   min=41.35µs  med=2.22ms  max=74.37ms p(90)=10.96ms p(95)=15.25ms
     http_reqs......................: 1669574 20869.578789/s
     iteration_duration.............: avg=4.37ms  min=107.18µs med=2.35ms  max=92.76ms p(90)=11.23ms p(95)=15.57ms
     iterations.....................: 1669574 20869.578789/s
     vus............................: 1       min=1          max=199  
     vus_max........................: 200     min=200        max=200  

[github-actions]

🐋 This PR was built and pushed to the following Docker images:

Docker Bake metadata

{
"conductor": {
  "containerimage.config.digest": "sha256:55a01acf2acf8984f6df17c95c8050247be71cea50a8ce3af5c672d14dd9b6c8",
  "containerimage.descriptor": {
    "mediaType": "application/vnd.docker.distribution.manifest.v2+json",
    "digest": "sha256:d5f03893457dd2b96debf7674320e82a133add991e81ffac8dd53ac90720bda5",
    "size": 901,
    "platform": {
      "architecture": "amd64",
      "os": "linux"
    }
  },
  "containerimage.digest": "sha256:d5f03893457dd2b96debf7674320e82a133add991e81ffac8dd53ac90720bda5",
  "image.name": "ghcr.io/the-guild-org/conductor-t2/conductor:021090b976fbff2e44779e29ae68117fb64b8dc7"
}
}

[YassinEldeeb]

Review and rebase with #164