[v8.2.x] CI: Update Dockerfile (#42529)

* Update Dockerfile

* Run apt-get update before download service clients

scripts/build/ci-build/Dockerfile

@@ -96,6 +96,11 @@ RUN curl -fLO https://github.com/cuelang/cue/releases/download/v${CUE_VERSION}/c
 RUN echo $CUE_CHKSUM cue_${CUE_VERSION}_Linux_x86_64.tar.gz | sha256sum --check --strict --status
 RUN tar xf cue_${CUE_VERSION}_Linux_x86_64.tar.gz -C /tmp cue
 
+ARG DOCKERIZE_VERSION=0.6.1
+RUN curl -fLO https://github.com/jwilder/dockerize/releases/download/v${DOCKERIZE_VERSION}/dockerize-linux-amd64-v${DOCKERIZE_VERSION}.tar.gz
+RUN tar -xzvf dockerize-linux-amd64-v${DOCKERIZE_VERSION}.tar.gz -C /tmp/
+RUN rm dockerize-linux-amd64-v${DOCKERIZE_VERSION}.tar.gz
+
 # Base image to crossbuild grafana.
 # Use old Debian (this has support into 2022) in order to ensure binary compatibility with older glibc's.
 FROM debian:stretch-20210208
@@ -113,6 +118,7 @@ COPY --from=toolchain /tmp/x86_64-centos6-linux-gnu.tar.xz /tmp/osxcross.tar.xz
 COPY --from=toolchain /tmp/golangci-lint /usr/local/bin/
 COPY --from=toolchain /tmp/shellcheck /usr/local/bin/
 COPY --from=toolchain /tmp/cue /usr/local/bin/
+COPY --from=toolchain /tmp/dockerize /usr/local/bin/
 
 RUN apt-get update && \
     apt-get install -yq  \

scripts/drone/steps/lib.star

@@ -686,6 +686,7 @@ def postgres_integration_tests_step():
             'POSTGRES_HOST': 'postgres',
         },
         'commands': [
+            'apt-get update',
             'apt-get install -yq postgresql-client',
             'dockerize -wait tcp://postgres:5432 -timeout 120s',
             'psql -p 5432 -h postgres -U grafanatest -d grafanatest -f ' +
@@ -709,6 +710,7 @@ def mysql_integration_tests_step():
             'MYSQL_HOST': 'mysql',
         },
         'commands': [
+            'apt-get update',
             'apt-get install -yq default-mysql-client',
             'dockerize -wait tcp://mysql:3306 -timeout 120s',
             'cat devenv/docker/blocks/mysql_tests/setup.sql | mysql -h mysql -P 3306 -u root -prootpass',