Add workflow to update Pipfile.lock weekly (#1542)

* Create workflow to update the Pipfile.lock weekly

* Update-pipfile: Also install wheel

* Install wheel in different step

* Pipfile: Only lock major versions

Assumes Semantic Versioning, and only sets the major versions of all packages

* Run update-pipfile on changes in pipfile and use tensorflow

Move from tensorflow-gpu to tensorflow, an excelent test for this PR

* [create-pull-request] automated change

Co-authored-by: github-actions[bot] <41898282+github-actions[bot]@users.noreply.github.com>
old-commit-hash: b1795235f9

.github/workflows/update-pipfile.yml

@@ -0,0 +1,25 @@
+name: "Update Pipfile.lock"
+on:
+  schedule:
+    - cron: '00 08 * * 1' # Every monday on 08:00 UTC
+  push:
+    paths:
+    - 'Pipfile'
+
+jobs:
+  piplock:
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@v2
+    - uses: actions/setup-python@v2
+    - run: pip install wheel
+    - run: pip install pipenv
+    - run: pipenv lock --requirements
+    - uses: actions/upload-artifact@v2
+      with:
+        name: "Pipfile lock"
+        path: Pipfile.lock
+    - uses: peter-evans/create-pull-request@v2
+      with:
+        title: "Update Pipfile.lock (dependencies)"
+        branch: update-pipfile

Pipfile

@@ -1,3 +1,3 @@
 version https://git-lfs.github.com/spec/v1
-oid sha256:cea367bec17a6ab70a2f9bde13478bd5086d58fe950582791e518f2008c49275
-size 2049
+oid sha256:48daf8ab5c86410503faaec54272993937b8dc2fd6793243689e91872f53136f
+size 2026

Pipfile.lock

@@ -1,3 +1,3 @@
 version https://git-lfs.github.com/spec/v1
-oid sha256:0a4c95baea82430dbc30b744f9247c59b300744a3bae619b0aeb8b0c8e0c5418
-size 165615
+oid sha256:d83cbfc6d5133bc70781d6eca454685b6946306d93f02296a13e877589ae783c
+size 156776