[FIX] Pass TEST_HTTPBIN_HOST secret to CI test workflows

Add TEST_HTTPBIN_HOST environment variable to CI workflows to fix test failures.

Changes:
- Add TEST_HTTPBIN_HOST to workflow secrets in _test.yml
- Pass TEST_HTTPBIN_HOST to test environment in _test.yml
- Pass TEST_HTTPBIN_HOST from ci.yml to _test.yml workflow

Impact:
- Edge case security tests can now access httpmorph-bin test server in CI
- Buffer reallocation tests can run in CI environment
- Fixes collection errors: "TEST_HTTPBIN_HOST environment variable is not set"

Related:
- Works together with previous commit making dotenv import optional
- TEST_HTTPBIN_HOST must be configured as repository secret in GitHub

Author: arman-bd

.github/workflows/_test.yml

@@ -18,6 +18,8 @@ on:
     secrets:
       TEST_PROXY_URL:
         required: false
+      TEST_HTTPBIN_HOST:
+        required: false
       CODECOV_TOKEN:
         required: false
 
@@ -234,6 +236,7 @@ jobs:
         pytest tests/ -v --cov=httpmorph --cov-report=xml -m "not proxy"
       env:
         TEST_PROXY_URL: ${{ secrets.TEST_PROXY_URL }}
+        TEST_HTTPBIN_HOST: ${{ secrets.TEST_HTTPBIN_HOST }}
 
     - name: Upload coverage
       if: matrix.os == inputs.primary-os && matrix.python-version == inputs.primary-python

.github/workflows/ci.yml

@@ -28,6 +28,7 @@ jobs:
       primary-python: ${{ needs.load-config.outputs.primary-python }}
     secrets:
       TEST_PROXY_URL: ${{ secrets.TEST_PROXY_URL }}
+      TEST_HTTPBIN_HOST: ${{ secrets.TEST_HTTPBIN_HOST }}
       CODECOV_TOKEN: ${{ secrets.CODECOV_TOKEN }}
 
   # ============================================================