add tests, requirment and workflow

.github/workflows/scheme_test.yml

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+name: Proxy Schema Test
+
+on:
+  workflow_dispatch:
+    inputs:
+      NETWORK:
+        description: 'Network to run test on'
+        required: true
+        default: 'local'
+        type: choice
+        options: 
+        - local
+        - dev
+        - qa
+        - test
+        - main
+  push:
+
+
+jobs:
+  api-tests:
+    runs-on: ubuntu-latest
+    defaults:
+      run:
+        working-directory: grid-proxy
+    services:
+      postgres:
+        image: postgres
+        env:
+          POSTGRES_USER: postgres
+          POSTGRES_PASSWORD: postgres
+          POSTGRES_DB: tfgrid-graphql
+        options: >-
+          --health-cmd pg_isready
+          --health-interval 10s
+          --health-timeout 5s
+          --health-retries 5
+        ports:
+          - 5432:5432
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      - name: Set up Go
+        uses: actions/setup-go@v5
+        with:
+          go-version: 1.21
+
+      - name: Setting up Python
+        uses: actions/setup-python@v5
+        with:
+          python-version: "3.10"
+
+      - name: Installing all necessary packages
+        run: pip install -r tests/schema_test/requirments.txt
+
+      - name: Build
+        run: |
+          export PATH=/home/runner/go/bin:$PATH
+          export GIT_COMMIT=$(git rev-list -1 HEAD) 
+          go build -ldflags "-X main.GitCommit=$GIT_COMMIT" cmds/proxy_server/main.go
+        env:
+          GO111MODULE: on
+
+      - name: Run tests
+        run: NETWORK=${{ github.event.inputs.NETWORK }} python3 -m pytest -v ./tests/schema_test/ --html=./tests/schema_test/report.html
+
+      - name: Upload pytest test results
+        uses: actions/upload-artifact@v4
+        with:
+          name: schema-pytest-results
+          path: |
+            ///home/runner/work/tfgrid-sdk-go/tfgrid-sdk-go/grid-proxy/tests/schema_test/report.html
+            ///home/runner/work/tfgrid-sdk-go/tfgrid-sdk-go/grid-proxy/tests/schema_test/assets
+        if: ${{ always() }}

grid-proxy/tests/schema_test/requirments.txt

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+pytest==7.3.1
+schemathesis==3.24.3
+pytest-html==4.1.1

grid-proxy/tests/schema_test/test_schema.py

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+import os
+import pytest
+import schemathesis
+from schemathesis.checks import not_a_server_error, status_code_conformance, content_type_conformance, response_schema_conformance, response_headers_conformance
+
+network = os.environ['NETWORK']
+url = 'http://localhost:8080'
+if network == 'dev':
+    url = 'https://gridproxy.dev.grid.tf'
+
+schema = schemathesis.from_path("docs/swagger.json", base_url = url)
+
+
+@pytest.mark.parametrize("check", [not_a_server_error, status_code_conformance, content_type_conformance, response_schema_conformance, response_headers_conformance])
+@schema.parametrize()
+def test_api(case, check):
+    response = case.call()
+    case.validate_response(response, checks=(check,))