settings: Add push_registration_encryption_keys map.

The `push_registration_encryption_keys` map stores the
assymetric key pair generated on bouncer.

The public key will be used by the client to encrypt
registration data and the bouncer will use the corresponding
private key to decrypt.

- Updated the `generate_secrets.py` script to generate the map
during installation in dev environment.
- Added a management command to add / remove key i.e. use it
for key rotation while retaining the older key-pair for a period
of time.

uv.lock

@@ -3300,6 +3300,26 @@ wheels = [
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 ]
 
+[[package]]
+name = "pynacl"
+version = "1.5.0"
+source = { registry = "https://pypi.org/simple" }
+dependencies = [
+    { name = "cffi" },
+]
+sdist = { url = "https://files.pythonhosted.org/packages/a7/22/27582568be639dfe22ddb3902225f91f2f17ceff88ce80e4db396c8986da/PyNaCl-1.5.0.tar.gz", hash = "sha256:8ac7448f09ab85811607bdd21ec2464495ac8b7c66d146bf545b0f08fb9220ba", size = 3392854, upload-time = "2022-01-07T22:05:41.134Z" }
+wheels = [
+    { url = "https://files.pythonhosted.org/packages/ce/75/0b8ede18506041c0bf23ac4d8e2971b4161cd6ce630b177d0a08eb0d8857/PyNaCl-1.5.0-cp36-abi3-macosx_10_10_universal2.whl", hash = "sha256:401002a4aaa07c9414132aaed7f6836ff98f59277a234704ff66878c2ee4a0d1", size = 349920, upload-time = "2022-01-07T22:05:49.156Z" },
+    { url = "https://files.pythonhosted.org/packages/59/bb/fddf10acd09637327a97ef89d2a9d621328850a72f1fdc8c08bdf72e385f/PyNaCl-1.5.0-cp36-abi3-manylinux_2_17_aarch64.manylinux2014_aarch64.manylinux_2_24_aarch64.whl", hash = "sha256:52cb72a79269189d4e0dc537556f4740f7f0a9ec41c1322598799b0bdad4ef92", size = 601722, upload-time = "2022-01-07T22:05:50.989Z" },
+    { url = "https://files.pythonhosted.org/packages/5d/70/87a065c37cca41a75f2ce113a5a2c2aa7533be648b184ade58971b5f7ccc/PyNaCl-1.5.0-cp36-abi3-manylinux_2_17_aarch64.manylinux2014_aarch64.whl", hash = "sha256:a36d4a9dda1f19ce6e03c9a784a2921a4b726b02e1c736600ca9c22029474394", size = 680087, upload-time = "2022-01-07T22:05:52.539Z" },
+    { url = "https://files.pythonhosted.org/packages/ee/87/f1bb6a595f14a327e8285b9eb54d41fef76c585a0edef0a45f6fc95de125/PyNaCl-1.5.0-cp36-abi3-manylinux_2_17_x86_64.manylinux2014_x86_64.manylinux_2_24_x86_64.whl", hash = "sha256:0c84947a22519e013607c9be43706dd42513f9e6ae5d39d3613ca1e142fba44d", size = 856678, upload-time = "2022-01-07T22:05:54.251Z" },
+    { url = "https://files.pythonhosted.org/packages/66/28/ca86676b69bf9f90e710571b67450508484388bfce09acf8a46f0b8c785f/PyNaCl-1.5.0-cp36-abi3-manylinux_2_17_x86_64.manylinux2014_x86_64.whl", hash = "sha256:06b8f6fa7f5de8d5d2f7573fe8c863c051225a27b61e6860fd047b1775807858", size = 1133660, upload-time = "2022-01-07T22:05:56.056Z" },
+    { url = "https://files.pythonhosted.org/packages/3d/85/c262db650e86812585e2bc59e497a8f59948a005325a11bbbc9ecd3fe26b/PyNaCl-1.5.0-cp36-abi3-musllinux_1_1_aarch64.whl", hash = "sha256:a422368fc821589c228f4c49438a368831cb5bbc0eab5ebe1d7fac9dded6567b", size = 663824, upload-time = "2022-01-07T22:05:57.434Z" },
+    { url = "https://files.pythonhosted.org/packages/fd/1a/cc308a884bd299b651f1633acb978e8596c71c33ca85e9dc9fa33a5399b9/PyNaCl-1.5.0-cp36-abi3-musllinux_1_1_x86_64.whl", hash = "sha256:61f642bf2378713e2c2e1de73444a3778e5f0a38be6fee0fe532fe30060282ff", size = 1117912, upload-time = "2022-01-07T22:05:58.665Z" },
+    { url = "https://files.pythonhosted.org/packages/25/2d/b7df6ddb0c2a33afdb358f8af6ea3b8c4d1196ca45497dd37a56f0c122be/PyNaCl-1.5.0-cp36-abi3-win32.whl", hash = "sha256:e46dae94e34b085175f8abb3b0aaa7da40767865ac82c928eeb9e57e1ea8a543", size = 204624, upload-time = "2022-01-07T22:06:00.085Z" },
+    { url = "https://files.pythonhosted.org/packages/5e/22/d3db169895faaf3e2eda892f005f433a62db2decbcfbc2f61e6517adfa87/PyNaCl-1.5.0-cp36-abi3-win_amd64.whl", hash = "sha256:20f42270d27e1b6a29f54032090b972d97f0a1b0948cc52392041ef7831fee93", size = 212141, upload-time = "2022-01-07T22:06:01.861Z" },
+]
+
 [[package]]
 name = "pyoembed"
 version = "0.1.2"
@@ -5320,6 +5340,7 @@ dev = [
     { name = "pyinotify" },
     { name = "pyjwt" },
     { name = "pymongo" },
+    { name = "pynacl" },
     { name = "pyoembed" },
     { name = "python-binary-memcached" },
     { name = "python-dateutil" },
@@ -5440,6 +5461,7 @@ prod = [
     { name = "pygments" },
     { name = "pyjwt" },
     { name = "pymongo" },
+    { name = "pynacl" },
     { name = "pyoembed" },
     { name = "python-binary-memcached" },
     { name = "python-dateutil" },
@@ -5540,6 +5562,7 @@ dev = [
     { name = "pyinotify" },
     { name = "pyjwt" },
     { name = "pymongo" },
+    { name = "pynacl" },
     { name = "pyoembed" },
     { name = "python-binary-memcached" },
     { name = "python-dateutil" },
@@ -5661,6 +5684,7 @@ prod = [
     { name = "pygments" },
     { name = "pyjwt" },
     { name = "pymongo" },
+    { name = "pynacl" },
     { name = "pyoembed" },
     { name = "python-binary-memcached" },
     { name = "python-dateutil" },