Create a pre-work onboarding issue template for general DevOps CoP members

### Overview

We need an onboarding issue that a new DevOps CoP member can open for themselves, because right
now one does not exist. `devops` has templates only for onboarding and offboarding *leads*, and
those are performed by an existing lead rather than by the newcomer. `devops-security` has a
self-serve pre-work checklist, but it is specific to that repo and takes the member through
creating a personal AWS account and running Terraform. A person who joins the CoP and is not
going to work on devops-security therefore has no onboarding issue at all, and nothing tracks
whether they ever got set up.

### Action Items

- [ ] Confirm with the leads what a general CoP member is actually expected to do in their first
two weeks. This is the part that needs a decision, not just drafting — the answer
determines everything below.
- [ ] Write the template into `.github/ISSUE_TEMPLATE/` as a markdown template, following the
shape of devops-security's pre-work template: self-assign, pick a role label, set status,
add to the board, attend the meeting.
- [ ] Set `labels:` in the frontmatter. Note `devops` has no equivalent of devops-security's
`complexity: prework` label — decide whether to add one or use `complexity: small`.
- [ ] Keep the AWS and Terraform steps out. If a member later joins devops-security work, they
open that repo's pre-work issue then. Link to it rather than duplicating it.
- [ ] Add the template to `.github/ISSUE_TEMPLATE/config.yml` if that file gates what appears in
the picker.
- [ ] After the PR merges, go to the repo's "New issue" page and confirm the template appears and
produces a correctly labelled issue. GitHub renders the picker from the default branch
only, so this cannot be verified from your branch.

### Resources/Instructions

- Shape to follow: [pre-work-template-devops-security.md](https://github.com/hackforla/devops-security/blob/main/.github/ISSUE_TEMPLATE/pre-work-template-devops-security.md)
- What `devops` has today: `onboard-ops-cop-lead.md`, `offboard-ops-cop-lead.md`,
`recruit-new-lead.md`, `post-an-open-role.md`, plus the two blank forms — none of them is a
member self-onboarding issue
- The default branch of `devops` is `master`, not `main`
- This template is what the team-side checklist (sibling issue) will point new members at, so the
two should agree on what the member is asked to do

Start by reviewing .github/ISSUE_TEMPLATE/pre-work-template-devops-security.md and the existing devops templates, then confirm the general member expectations with the leads. Create the self-serve markdown template in .github/ISSUE_TEMPLATE/, update config.yml if needed, and keep AWS/Terraform steps out. Done means the merged template appears in the New issue picker on master and creates a correctly labelled issue.

索引モデルが issue の本文から書いたものです。