build(python): avoid using requirements.in (reanahub#448)

Pass the correct extras to `pip-compile` instead of duplicating
requirements in `requirements.in`.

requirements.txt

@@ -2,7 +2,7 @@
 # This file is autogenerated by pip-compile with Python 3.8
 # by the following command:
 #
-#    pip-compile --annotation-style=line --output-file=requirements.txt requirements.in setup.py
+#    pip-compile --annotation-style=line --extra=ssh --output-file=requirements.txt setup.py
 #
 alembic==1.13.1           # via reana-db
 amqp==5.2.0               # via kombu
@@ -26,7 +26,7 @@ decorator==5.1.1          # via gssapi
 flask==2.1.3              # via reana-job-controller (setup.py)
 fs==2.4.16                # via reana-commons, reana-job-controller (setup.py)
 google-auth==2.28.1       # via kubernetes
-gssapi==1.6.1             # via -r requirements.in, paramiko
+gssapi==1.6.1             # via paramiko, reana-job-controller (setup.py)
 idna==3.6                 # via jsonschema, requests
 importlib-metadata==7.0.1  # via alembic, flask
 importlib-resources==6.1.2  # via alembic
@@ -45,7 +45,7 @@ monotonic==1.6            # via bravado
 msgpack==1.0.7            # via bravado-core
 msgpack-python==0.5.6     # via bravado
 oauthlib==3.2.2           # via requests-oauthlib
-paramiko[gssapi]==3.0.0   # via -r requirements.in
+paramiko[gssapi]==3.0.0   # via reana-job-controller (setup.py)
 psycopg2-binary==2.9.9    # via reana-db
 pyasn1==0.5.1             # via paramiko, pyasn1-modules, rsa
 pyasn1-modules==0.3.0     # via google-auth
@@ -55,8 +55,8 @@ pyrsistent==0.20.0        # via jsonschema
 python-dateutil==2.9.0    # via bravado, bravado-core, kubernetes
 pytz==2024.1              # via bravado-core
 pyyaml==6.0.1             # via apispec, bravado, bravado-core, kubernetes, reana-commons, swagger-spec-validator
-reana-commons[kubernetes]==0.95.0a2	# via reana-db, reana-job-controller (setup.py)
-reana-db==0.95.0a2	# via reana-job-controller (setup.py)
+reana-commons[kubernetes]==0.95.0a2  # via reana-db, reana-job-controller (setup.py)
+reana-db==0.95.0a2        # via reana-job-controller (setup.py)
 requests==2.31.0          # via bravado, bravado-core, kubernetes, requests-oauthlib
 requests-oauthlib==1.3.1  # via kubernetes
 retrying==1.3.4           # via reana-job-controller (setup.py)

setup.py

@@ -1,7 +1,7 @@
 # -*- coding: utf-8 -*-
 #
 # This file is part of REANA.
-# Copyright (C) 2017, 2018, 2019, 2020, 2021, 2022, 2023 CERN.
+# Copyright (C) 2017, 2018, 2019, 2020, 2021, 2022, 2023, 2024 CERN.
 #
 # REANA is free software; you can redistribute it and/or modify it
 # under the terms of the MIT License; see LICENSE file for more details.
@@ -40,7 +40,10 @@
         "htcondor==9.0.17",
     ],
     "tests": tests_require,
-    "ssh": ["paramiko[gssapi]>=3.0.0"],
+    "ssh": [
+        "paramiko[gssapi]>=3.0.0",
+        "gssapi==1.6.1",  # matches version in Dockerfile
+    ],
 }
 
 # Python tests need SSH dependencies for imports