remove unnecessary docker_config secret from drone config

.drone.jsonnet

@@ -17,7 +17,6 @@ local PythonVersion(pyversion='3.6') = {
 
 local PipelineLint = {
   kind: 'pipeline',
-  image_pull_secrets: ['docker_config'],
   name: 'lint',
   platform: {
     os: 'linux',
@@ -58,7 +57,6 @@ local PipelineLint = {
 
 local PipelineTest = {
   kind: 'pipeline',
-  image_pull_secrets: ['docker_config'],
   name: 'test',
   platform: {
     os: 'linux',
@@ -105,7 +103,6 @@ local PipelineTest = {
 
 local PipelineSecurity = {
   kind: 'pipeline',
-  image_pull_secrets: ['docker_config'],
   name: 'security',
   platform: {
     os: 'linux',
@@ -136,7 +133,6 @@ local PipelineSecurity = {
 
 local PipelineBuildPackage = {
   kind: 'pipeline',
-  image_pull_secrets: ['docker_config'],
   name: 'build-package',
   platform: {
     os: 'linux',
@@ -203,7 +199,6 @@ local PipelineBuildPackage = {
 
 local PipelineDocs = {
   kind: 'pipeline',
-  image_pull_secrets: ['docker_config'],
   name: 'docs',
   platform: {
     os: 'linux',
@@ -307,7 +302,6 @@ local PipelineDocs = {
 
 local PipelineNotifications = {
   kind: 'pipeline',
-  image_pull_secrets: ['docker_config'],
   name: 'notifications',
   platform: {
     os: 'linux',

.drone.yml

@@ -27,9 +27,6 @@ steps:
   environment:
     PY_COLORS: 1
 
-image_pull_secrets:
-- docker_config
-
 trigger:
   ref:
   - refs/heads/main
@@ -113,9 +110,6 @@ steps:
   - python38-pytest
   - python39-pytest
 
-image_pull_secrets:
-- docker_config
-
 trigger:
   ref:
   - refs/heads/main
@@ -144,9 +138,6 @@ steps:
   environment:
     PY_COLORS: 1
 
-image_pull_secrets:
-- docker_config
-
 trigger:
   ref:
   - refs/heads/main
@@ -209,9 +200,6 @@ steps:
     ref:
     - refs/tags/**
 
-image_pull_secrets:
-- docker_config
-
 trigger:
   ref:
   - refs/heads/main
@@ -300,9 +288,6 @@ steps:
     - refs/heads/main
     - refs/tags/**
 
-image_pull_secrets:
-- docker_config
-
 trigger:
   ref:
   - refs/heads/main
@@ -338,9 +323,6 @@ steps:
     - success
     - failure
 
-image_pull_secrets:
-- docker_config
-
 trigger:
   ref:
   - refs/heads/main
@@ -354,6 +336,6 @@ depends_on:
 
 ---
 kind: signature
-hmac: fc609e2b288f496650963d3d06ac95c2be7e63e959e421e7123f76df0c7fb368
+hmac: fca915a287fa658c8bab5a647308b977ce6d003983709156e0d0bbb763f60cc0
 
 ...