Add support for workflow_dispatch (#3334)

Closes #2797

I'm aware of https://github.com/go-gitea/gitea/pull/28163 exists, but since I had it laying around on my drive and collecting dust, I might as well open a PR for it if anyone wants the feature a bit sooner than waiting for upstream to release it or to be a forgejo "native" implementation.

This PR Contains:
- Support for the `workflow_dispatch` trigger
- Inputs: boolean, string, number, choice

Things still to be done:
- [x] API Endpoint `/api/v1/<org>/<repo>/actions/workflows/<workflow id>/dispatches`
- ~~Fixing some UI bugs I had no time figuring out, like why dropdown/choice inputs's menu's behave weirdly~~ Unrelated visual bug with dropdowns inside dropdowns
- [x] Fix bug where opening the branch selection submits the form
- [x] Limit on inputs to render/process

Things not in this PR:
- Inputs: environment (First need support for environments in forgejo)

Things needed to test this:
- A patch for https://code.forgejo.org/forgejo/runner to actually consider the inputs inside the workflow.
  ~~One possible patch can be seen here: https://code.forgejo.org/Mai-Lapyst/runner/src/branch/support-workflow-inputs~~
  [PR](https://code.forgejo.org/forgejo/runner/pulls/199)

![image](/attachments/2db50c9e-898f-41cb-b698-43edeefd2573)

## Testing

- Checkout PR
- Setup new development runner with [this PR](https://code.forgejo.org/forgejo/runner/pulls/199)
- Create a repo with a workflow (see below)
- Go to the actions tab, select the workflow and see the notice as in the screenshot above
- Use the button + dropdown to run the workflow
  - Try also running it via the api using the `` endpoint
- ...
- Profit!

<details>
<summary>Example workflow</summary>

```yaml
on:
  workflow_dispatch:
    inputs:
      logLevel:
        description: 'Log Level'
        required: true
        default: 'warning'
        type: choice
        options:
        - info
        - warning
        - debug
      tags:
        description: 'Test scenario tags'
        required: false
        type: boolean
      boolean_default_true:
        description: 'Test scenario tags'
        required: true
        type: boolean
        default: true
      boolean_default_false:
        description: 'Test scenario tags'
        required: false
        type: boolean
        default: false
      number1_default:
        description: 'Number w. default'
        default: '100'
        type: number
      number2:
        description: 'Number w/o. default'
        type: number
      string1_default:
        description: 'String w. default'
        default: 'Hello world'
        type: string
      string2:
        description: 'String w/o. default'
        required: true
        type: string

jobs:
  test:
    runs-on: docker
    steps:
      - uses: actions/checkout@v3
      - run: whoami
      - run: cat /etc/issue
      - run: uname -a
      - run: date
      - run: echo ${{ inputs.logLevel }}
      - run: echo ${{ inputs.tags }}
      - env:
          GITHUB_CONTEXT: ${{ toJson(github) }}
        run: echo "$GITHUB_CONTEXT"
      - run: echo "abc"
```
</details>

Reviewed-on: https://codeberg.org/forgejo/forgejo/pulls/3334
Reviewed-by: Earl Warren <earl-warren@noreply.codeberg.org>
Co-authored-by: Mai-Lapyst <mai-lapyst@noreply.codeberg.org>
Co-committed-by: Mai-Lapyst <mai-lapyst@noreply.codeberg.org>

models/fixtures/repo_unit.yml

@@ -750,3 +750,41 @@
   type: 3
   config: "{\"IgnoreWhitespaceConflicts\":false,\"AllowMerge\":true,\"AllowRebase\":true,\"AllowRebaseMerge\":true,\"AllowSquash\":true}"
   created_unix: 946684810
+
+-
+  id: 108
+  repo_id: 62
+  type: 1
+  config: "{}"
+  created_unix: 946684810
+
+-
+  id: 109
+  repo_id: 62
+  type: 2
+  created_unix: 946684810
+
+-
+  id: 110
+  repo_id: 62
+  type: 3
+  created_unix: 946684810
+
+-
+  id: 111
+  repo_id: 62
+  type: 4
+  created_unix: 946684810
+
+-
+  id: 112
+  repo_id: 62
+  type: 5
+  created_unix: 946684810
+
+-
+  id: 113
+  repo_id: 62
+  type: 10
+  config: "{}"
+  created_unix: 946684810

models/fixtures/repository.yml

@@ -1782,3 +1782,33 @@
   size: 0
   is_fsck_enabled: true
   close_issues_via_commit_in_any_branch: false
+
+- id: 62
+  owner_id: 2
+  owner_name: user2
+  lower_name: test_workflows
+  name: test_workflows
+  default_branch: main
+  num_watches: 0
+  num_stars: 0
+  num_forks: 0
+  num_issues: 0
+  num_closed_issues: 0
+  num_pulls: 0
+  num_closed_pulls: 0
+  num_milestones: 0
+  num_closed_milestones: 0
+  num_projects: 0
+  num_closed_projects: 0
+  is_private: false
+  is_empty: false
+  is_archived: false
+  is_mirror: false
+  status: 0
+  is_fork: false
+  fork_id: 0
+  is_template: false
+  template_id: 0
+  size: 0
+  is_fsck_enabled: true
+  close_issues_via_commit_in_any_branch: false

models/fixtures/user.yml

@@ -66,7 +66,7 @@
   num_followers: 2
   num_following: 1
   num_stars: 2
-  num_repos: 16
+  num_repos: 17
   num_teams: 0
   num_members: 0
   visibility: 0

models/repo/repo_list_test.go

@@ -138,27 +138,27 @@ func getTestCases() []struct {
 		{
 			name:  "AllPublic/PublicRepositoriesOfUserIncludingCollaborative",
 			opts:  &repo_model.SearchRepoOptions{ListOptions: db.ListOptions{Page: 1, PageSize: 10}, OwnerID: 15, AllPublic: true, Template: optional.Some(false)},
-			count: 34,
+			count: 35,
 		},
 		{
 			name:  "AllPublic/PublicAndPrivateRepositoriesOfUserIncludingCollaborative",
 			opts:  &repo_model.SearchRepoOptions{ListOptions: db.ListOptions{Page: 1, PageSize: 10}, OwnerID: 15, Private: true, AllPublic: true, AllLimited: true, Template: optional.Some(false)},
-			count: 39,
+			count: 40,
 		},
 		{
 			name:  "AllPublic/PublicAndPrivateRepositoriesOfUserIncludingCollaborativeByName",
 			opts:  &repo_model.SearchRepoOptions{Keyword: "test", ListOptions: db.ListOptions{Page: 1, PageSize: 10}, OwnerID: 15, Private: true, AllPublic: true},
-			count: 15,
+			count: 16,
 		},
 		{
 			name:  "AllPublic/PublicAndPrivateRepositoriesOfUser2IncludingCollaborativeByName",
 			opts:  &repo_model.SearchRepoOptions{Keyword: "test", ListOptions: db.ListOptions{Page: 1, PageSize: 10}, OwnerID: 18, Private: true, AllPublic: true},
-			count: 13,
+			count: 14,
 		},
 		{
 			name:  "AllPublic/PublicRepositoriesOfOrganization",
 			opts:  &repo_model.SearchRepoOptions{ListOptions: db.ListOptions{Page: 1, PageSize: 10}, OwnerID: 17, AllPublic: true, Collaborate: optional.Some(false), Template: optional.Some(false)},
-			count: 34,
+			count: 35,
 		},
 		{
 			name:  "AllTemplates",