add dockerhub auth for ci

.drone.jsonnet

@@ -16,6 +16,7 @@ local PythonVersion(pyversion='2.7') = {
 
 local PipelineLint = {
   kind: 'pipeline',
+  image_pull_secrets: ['docker_config'],
   name: 'lint',
   platform: {
     os: 'linux',
@@ -42,6 +43,7 @@ local PipelineLint = {
 
 local PipelineTest = {
   kind: 'pipeline',
+  image_pull_secrets: ['docker_config'],
   name: 'test',
   platform: {
     os: 'linux',
@@ -83,6 +85,7 @@ local PipelineTest = {
 
 local PipelineSecurity = {
   kind: 'pipeline',
+  image_pull_secrets: ['docker_config'],
   name: 'security',
   platform: {
     os: 'linux',
@@ -112,6 +115,7 @@ local PipelineSecurity = {
 
 local PipelineBuildPackage = {
   kind: 'pipeline',
+  image_pull_secrets: ['docker_config'],
   name: 'build-package',
   platform: {
     os: 'linux',
@@ -173,6 +177,7 @@ local PipelineBuildPackage = {
 
 local PipelineDocs = {
   kind: 'pipeline',
+  image_pull_secrets: ['docker_config'],
   name: 'docs',
   platform: {
     os: 'linux',
@@ -280,6 +285,7 @@ local PipelineDocs = {
 
 local PipelineNotifications = {
   kind: 'pipeline',
+  image_pull_secrets: ['docker_config'],
   name: 'notifications',
   platform: {
     os: 'linux',

.drone.yml

@@ -16,6 +16,9 @@ steps:
   environment:
     PY_COLORS: 1
 
+image_pull_secrets:
+- docker_config
+
 trigger:
   ref:
   - refs/heads/master
@@ -102,6 +105,9 @@ steps:
   - python37-pytest
   - python38-pytest
 
+image_pull_secrets:
+- docker_config
+
 trigger:
   ref:
   - refs/heads/master
@@ -129,6 +135,9 @@ steps:
   environment:
     PY_COLORS: 1
 
+image_pull_secrets:
+- docker_config
+
 trigger:
   ref:
   - refs/heads/master
@@ -187,6 +196,9 @@ steps:
     ref:
     - refs/tags/**
 
+image_pull_secrets:
+- docker_config
+
 trigger:
   ref:
   - refs/heads/master
@@ -278,6 +290,9 @@ steps:
     - refs/heads/master
     - refs/tags/**
 
+image_pull_secrets:
+- docker_config
+
 trigger:
   ref:
   - refs/heads/master
@@ -313,6 +328,9 @@ steps:
     - success
     - failure
 
+image_pull_secrets:
+- docker_config
+
 trigger:
   ref:
   - refs/heads/master
@@ -326,6 +344,6 @@ depends_on:
 
 ---
 kind: signature
-hmac: 8eb3fca00d4d0a5ffc49ef56daa25334021a038636aa5e4c44962f70dbb9a7db
+hmac: 36e94ce280e52e18c290f7ee728d68f2353570df5e5327f649668af22f0005ea
 
 ...