cirrus ci: change cache key for pip dependencies

the cache should be considered stale if requirements.txt changes

.cirrus.yml

@@ -30,7 +30,7 @@ task:
         ELECTRUM_PYTHON_NAME: pypy3
   pip_cache:
     folder: ~/.cache/pip
-    fingerprint_script: echo $ELECTRUM_IMAGE && cat $ELECTRUM_REQUIREMENTS
+    fingerprint_script: echo $ELECTRUM_IMAGE && cat $ELECTRUM_REQUIREMENTS_CI && cat $ELECTRUM_REQUIREMENTS
     populate_script: mkdir -p ~/.cache/pip
   electrum_cache:
     folder: /tmp/electrum-build
@@ -42,13 +42,14 @@ task:
   install_script:
     - apt-get update
     - apt-get -y install libsecp256k1-0
-    - pip install -r $ELECTRUM_REQUIREMENTS
+    - pip install -r $ELECTRUM_REQUIREMENTS_CI
   tox_script:
     - tox
   coveralls_script:
     - if [ ! -z "$COVERALLS_REPO_TOKEN" ] ; then coveralls ; fi
   env:
-    ELECTRUM_REQUIREMENTS: contrib/requirements/requirements-travis.txt
+    ELECTRUM_REQUIREMENTS_CI: contrib/requirements/requirements-travis.txt
+    ELECTRUM_REQUIREMENTS: contrib/requirements/requirements.txt
     # following CI_* env vars are set up for coveralls
     CI_NAME: "CirrusCI"
     CI_BUILD_NUMBER: $CIRRUS_BUILD_ID
@@ -66,7 +67,7 @@ task:
     memory: 1G
   pip_cache:
     folder: ~/.cache/pip
-    fingerprint_script: echo Locale && echo $ELECTRUM_IMAGE && cat $ELECTRUM_REQUIREMENTS
+    fingerprint_script: echo Locale && echo $ELECTRUM_IMAGE && cat $ELECTRUM_REQUIREMENTS_CI
     populate_script: mkdir -p ~/.cache/pip
   electrum_cache:
     folder: /tmp/electrum-build
@@ -74,13 +75,13 @@ task:
   install_script:
     - apt-get update
     - apt-get -y install libsecp256k1-0 gettext
-    - pip install -r $ELECTRUM_REQUIREMENTS
+    - pip install -r $ELECTRUM_REQUIREMENTS_CI
     - pip install requests
   locale_script:
     - contrib/push_locale
   env:
     ELECTRUM_IMAGE: python:3.7
-    ELECTRUM_REQUIREMENTS: contrib/requirements/requirements-travis.txt
+    ELECTRUM_REQUIREMENTS_CI: contrib/requirements/requirements-travis.txt
     # in addition, crowdin_api_key is set as an "override" in https://cirrus-ci.com/settings/...
   depends_on:
     - Tox Python 3.9
@@ -124,7 +125,7 @@ task:
     - sleep 10s
     - python3 -m unittest electrum/tests/regtest.py
   env:
-    ELECTRUM_REQUIREMENTS: contrib/requirements/requirements-travis.txt
+    ELECTRUM_REQUIREMENTS: contrib/requirements/requirements.txt
     # ElectrumX exits with an error without this:
     ALLOW_ROOT: 1
 
@@ -146,7 +147,7 @@ task:
     - flake8 . --count --select=$ELECTRUM_LINTERS --show-source --statistics
   env:
     ELECTRUM_IMAGE: python:3.7
-    ELECTRUM_REQUIREMENTS: contrib/requirements/requirements-travis.txt
+    ELECTRUM_REQUIREMENTS: contrib/requirements/requirements.txt
   matrix:
     - name: Flake8 Mandatory
       env: