🚀 Update JCasC file to inclue seed job

[sydrawat01]

• Add --quiet option to wget command when downloading the plugin-manager-tool from github.com.
• Update seed job to JCasC template for either multibranch pipeline seed job or github organization folder seed job
• Update list of plugins to be installed. (see comment below for details)
• Update folder structure to move Jenkins related code and config files into a folder jenkins/, and keep the seed job Groovy script in the scripts/ folder. JCasC file should be in jenkins/ folder as well.
• [BUG] Fix Packer file provisioner to copy the JCasC file into /home/ubuntu,and use the install.sh script to move the file to Jenkins home, i.e., /var/lib/jenkins/ (use sudo) and update user & group to jenkins
  • sudo chown jenkins:jenkins /var/lib/jenkins/jcasc.yaml

[sydrawat01]

Here's a comprehensive, non-exhaustive list of plugins we can install:

ace-editor:latest
ant:latest
antisamy-markup-formatter:latest
apache-httpcomponents-client-4-api:latest
bootstrap4-api:latest
bootstrap5-api:latest
bouncycastle-api:latest
branch-api:latest
build-timeout:latest
build-pipeline-plugin:latest
caffeine-api:latest
checks-api:latest
cloudbees-folder:latest
command-launcher:latest
credentials:latest
credentials-binding:latest
display-url-api:latest
docker-plugin:latest
docker-commons:latest
docker-workflow:latest
docker-java-api:latest
durable-task:latest
echarts-api:latest
envinject:latest
email-ext:latest
font-awesome-api:latest
git:latest
git-client:latest
git-server:latest
github:latest
github-api:latest
github-branch-source:latest
gradle:latest
handlebars:latest
jackson2-api:latest
jaxb:latest
jdk-tool:latest
jjwt-api:latest
jquery3-api:latest
jsch:latest
junit:latest
ldap:latest
thinbackup:latest
lockable-resources:latest
mailer:latest
maven:latest
matrix-auth:latest
matrix-project:latest
momentjs:latest
nodejs:latest
okhttp-api:latest
pam-auth:latest
pipeline-build-step:latest
pipeline-github-lib:latest
pipeline-graph-analysis:latest
pipeline-input-step:latest
pipeline-milestone-step:latest
pipeline-model-api:latest
pipeline-model-definition:latest
pipeline-model-extensions:latest
pipeline-rest-api:latest
pipeline-stage-step:latest
pipeline-stage-tags-metadata:latest
pipeline-stage-view:latest
plain-credentials:latest
plugin-util-api:latest
popper-api:latest
popper2-api:latest
resource-disposer:latest
semantic-versioning-plugin:latest
scm-api:latest
script-security:latest
snakeyaml-api:latest
ssh-credentials:latest
ssh-slaves:latest
sshd:latest
structs:latest
timestamper:latest
token-macro:latest
trilead-api:latest
workflow-aggregator:latest
workflow-api:latest
workflow-basic-steps:latest
workflow-cps:latest
workflow-cps-global-lib:latest
workflow-durable-task-step:latest
workflow-job:latest
workflow-multibranch:latest
workflow-scm-step:latest
workflow-step-api:latest
workflow-support:latest
ws-cleanup:latest