docker: remove keys.gnupg.net dependency

Signed-off-by: Vicent Marti <vmg@strn.cat>

docker/bootstrap/Dockerfile.mariadb

@@ -4,7 +4,7 @@ ARG image="vitess/bootstrap:${bootstrap_version}-common"
 FROM "${image}"
 
 # Install MariaDB 10
-RUN for i in $(seq 1 10); do apt-key adv --no-tty --keyserver keys.gnupg.net --recv-keys 9334A25F8507EFA5 && break; done && \
+RUN for i in $(seq 1 10); do apt-key adv --no-tty --keyserver keyserver.ubuntu.com --recv-keys 9334A25F8507EFA5 && break; done && \
     add-apt-repository 'deb http://repo.percona.com/apt buster main' && \
     { \
         echo debconf debconf/frontend select Noninteractive; \

docker/bootstrap/Dockerfile.mysql56

@@ -12,7 +12,7 @@ FROM "${image}"
 #
 RUN for i in $(seq 1 10); do apt-key adv --no-tty --recv-keys --keyserver keyserver.ubuntu.com 8C718D3B5072E1F5 && break; done && \
     add-apt-repository 'deb http://repo.mysql.com/apt/debian/ stretch mysql-5.6' && \
-    for i in $(seq 1 10); do apt-key adv --no-tty --keyserver keys.gnupg.net --recv-keys 9334A25F8507EFA5 && break; done && \
+    for i in $(seq 1 10); do apt-key adv --no-tty --keyserver keyserver.ubuntu.com --recv-keys 9334A25F8507EFA5 && break; done && \
     echo 'deb http://repo.percona.com/apt buster main' > /etc/apt/sources.list.d/percona.list && \
     { \
         echo debconf debconf/frontend select Noninteractive; \

docker/bootstrap/Dockerfile.mysql57

@@ -7,7 +7,7 @@ FROM "${image}"
 RUN apt-get update && DEBIAN_FRONTEND=noninteractive apt-get install -y --no-install-recommends gnupg dirmngr ca-certificates && \
     for i in $(seq 1 10); do apt-key adv --no-tty --recv-keys --keyserver keyserver.ubuntu.com 8C718D3B5072E1F5 && break; done && \
     add-apt-repository 'deb http://repo.mysql.com/apt/debian/ buster mysql-5.7' && \
-    for i in $(seq 1 10); do apt-key adv --no-tty --keyserver keys.gnupg.net --recv-keys 9334A25F8507EFA5 && break; done && \
+    for i in $(seq 1 10); do apt-key adv --no-tty --keyserver keyserver.ubuntu.com --recv-keys 9334A25F8507EFA5 && break; done && \
     echo 'deb http://repo.percona.com/apt buster main' > /etc/apt/sources.list.d/percona.list && \
     { \
         echo debconf debconf/frontend select Noninteractive; \

docker/bootstrap/Dockerfile.mysql80

@@ -6,7 +6,7 @@ FROM "${image}"
 # Install MySQL 8.0
 RUN for i in $(seq 1 10); do apt-key adv --no-tty --recv-keys --keyserver keyserver.ubuntu.com 8C718D3B5072E1F5 && break; done && \
     add-apt-repository 'deb http://repo.mysql.com/apt/debian/ buster mysql-8.0' && \
-    for i in $(seq 1 10); do apt-key adv --no-tty --keyserver keys.gnupg.net --recv-keys 9334A25F8507EFA5 && break; done && \
+    for i in $(seq 1 10); do apt-key adv --no-tty --keyserver keyserver.ubuntu.com --recv-keys 9334A25F8507EFA5 && break; done && \
     echo 'deb http://repo.percona.com/apt buster main' > /etc/apt/sources.list.d/percona.list && \
     { \
         echo debconf debconf/frontend select Noninteractive; \

docker/bootstrap/Dockerfile.percona

@@ -14,7 +14,7 @@ FROM "${image}"
 # 'buster' repository as the 'stretch' package requires 'libcurl3' that is not present
 # in Debian Buster.
 #
-RUN for i in $(seq 1 10); do apt-key adv --no-tty --keyserver keys.gnupg.net --recv-keys 9334A25F8507EFA5 && break; done && \
+RUN for i in $(seq 1 10); do apt-key adv --no-tty --keyserver keyserver.ubuntu.com --recv-keys 9334A25F8507EFA5 && break; done && \
     add-apt-repository 'deb http://repo.percona.com/apt stretch main' && \
     add-apt-repository 'deb http://repo.percona.com/apt buster main' && \
     { \

docker/bootstrap/Dockerfile.percona57

@@ -4,7 +4,7 @@ ARG image="vitess/bootstrap:${bootstrap_version}-common"
 FROM "${image}"
 
 # Install Percona 5.7
-RUN for i in $(seq 1 10); do apt-key adv --no-tty --keyserver keys.gnupg.net --recv-keys 9334A25F8507EFA5 && break; done && \
+RUN for i in $(seq 1 10); do apt-key adv --no-tty --keyserver keyserver.ubuntu.com --recv-keys 9334A25F8507EFA5 && break; done && \
     add-apt-repository 'deb http://repo.percona.com/apt buster main' && \
     { \
         echo debconf debconf/frontend select Noninteractive; \

docker/bootstrap/Dockerfile.percona80

@@ -4,7 +4,7 @@ ARG image="vitess/bootstrap:${bootstrap_version}-common"
 FROM "${image}"
 
 # Install Percona 8.0
-RUN for i in $(seq 1 10); do apt-key adv --no-tty --keyserver keys.gnupg.net --recv-keys 9334A25F8507EFA5 && break; done \
+RUN for i in $(seq 1 10); do apt-key adv --no-tty --keyserver keyserver.ubuntu.com --recv-keys 9334A25F8507EFA5 && break; done \
     && echo 'deb http://repo.percona.com/ps-80/apt buster main' > /etc/apt/sources.list.d/percona.list && \
     { \
         echo debconf debconf/frontend select Noninteractive; \