Toolbx: Remove the Heroku and Percona repos.

With the recent changes with Heroku I don't see myself using Heroku any
time soon. As for Percona, I did a test with XtraBackup, but it requires
direct access to the database files so it's not useful in a Toolbx
container.

toolbx/Dockerfile

@@ -15,15 +15,12 @@ RUN rm /etc/apt/apt.conf.d/docker-* && \
     /usr/share/keyrings/google-cloud.gpg && \
     curl https://pgp.mongodb.com/server-5.0.asc | \
     gpg --no-default-keyring --import --batch --keyring /usr/share/keyrings/mongodb.gpg && \
-    curl https://cli-assets.heroku.com/apt/release.key | \
-    gpg --no-default-keyring --import --batch --keyring /usr/share/keyrings/heroku.gpg && \
     curl https://apt.releases.hashicorp.com/gpg | \
     gpg --no-default-keyring --import --batch --keyring /usr/share/keyrings/hashicorp.gpg && \
     curl https://dl.cloudsmith.io/public/cloudposse/packages/gpg.7333C6FDEFA717CC.key | \
     gpg --no-default-keyring --import --batch --keyring /usr/share/keyrings/cloudposse.gpg && \
     curl https://repo.charm.sh/apt/gpg.key | \
     gpg --no-default-keyring --import --batch --keyring /usr/share/keyrings/charm.gpg && \
-    gpg --no-default-keyring --keyring /usr/share/keyrings/percona.gpg --keyserver hkp://keyserver.ubuntu.com:80 --recv-keys 9334A25F8507EFA5 && \
     gpg --no-default-keyring --keyring /usr/share/keyrings/clickhouse.gpg --keyserver hkp://keyserver.ubuntu.com:80  --recv-keys 8919F6BD2B48D754 && \
     ln --symbolic --target /usr/local/bin/ /usr/libexec/flatpak-xdg-utils/* && \
     #mkdir /etc/krb5.conf.d && \

toolbx/README.md

@@ -12,13 +12,11 @@ Toolbox:
 
 Also. the following APT repositories are added:
 
-- Heroku.
 - Google Cloud.
 - MongoDB.
 - Hashicorp.
 - [Cloud Posse](https://github.com/cloudposse/packages).
 - [Charms](https://charm.sh/).
-- Percona.
 - ClickHouse.
 
 This image is based in part on the [toolbx

toolbx/sources.d/heroku.list

-deb [ signed-by=/usr/share/keyrings/heroku.gpg ] https://cli-assets.heroku.com/apt ./

toolbx/sources.d/percona.sources

-Types: deb
-URIs: https://repo.percona.com/apt/
-Suites: bullseye
-Components: main
-Signed-By: /usr/share/keyrings/percona.gpg