Support configuration variables on Gitea Actions (#24724)

Co-Author: @silverwind @wxiaoguang 
Replace: #24404

See:
- [defining configuration variables for multiple
workflows](https://docs.github.com/en/actions/learn-github-actions/variables#defining-configuration-variables-for-multiple-workflows)
- [vars
context](https://docs.github.com/en/actions/learn-github-actions/contexts#vars-context)

Related to:
- [x] protocol: https://gitea.com/gitea/actions-proto-def/pulls/7
- [x] act_runner: https://gitea.com/gitea/act_runner/pulls/157
- [x] act: https://gitea.com/gitea/act/pulls/43

#### Screenshoot
Create Variable:

![image](https://user-images.githubusercontent.com/33891828/236758288-032b7f64-44e7-48ea-b07d-de8b8b0e3729.png)


![image](https://user-images.githubusercontent.com/33891828/236758174-5203f64c-1d0e-4737-a5b0-62061dee86f8.png)

Workflow:
```yaml
  test_vars:
    runs-on: ubuntu-latest
    steps:
      - name: Print Custom Variables
        run: echo "${{ vars.test_key }}"
      - name: Try to print a non-exist var
        run: echo "${{ vars.NON_EXIST_VAR }}"
```

Actions Log:

![image](https://user-images.githubusercontent.com/33891828/236759075-af0c5950-368d-4758-a8ac-47a96e43b6e2.png)

---
This PR just implement the org / user (depends on the owner of the
current repository) and repo level variables, The Environment level
variables have not been implemented.
Because
[Environment](https://docs.github.com/en/actions/deployment/targeting-different-environments/using-environments-for-deployment#about-environments)
is a module separate from `Actions`. Maybe it would be better to create
a new PR to do it.

---------

Co-authored-by: silverwind <me@silverwind.io>
Co-authored-by: wxiaoguang <wxiaoguang@gmail.com>
Co-authored-by: Giteabot <teabot@gitea.io>

services/forms/user_form.go

@@ -367,8 +367,8 @@ func (f *AddKeyForm) Validate(req *http.Request, errs binding.Errors) binding.Er
 
 // AddSecretForm for adding secrets
 type AddSecretForm struct {
-	Title   string `binding:"Required;MaxSize(50)"`
-	Content string `binding:"Required"`
+	Name string `binding:"Required;MaxSize(255)"`
+	Data string `binding:"Required;MaxSize(65535)"`
 }
 
 // Validate validates the fields
@@ -377,6 +377,16 @@ func (f *AddSecretForm) Validate(req *http.Request, errs binding.Errors) binding
 	return middleware.Validate(errs, ctx.Data, f, ctx.Locale)
 }
 
+type EditVariableForm struct {
+	Name string `binding:"Required;MaxSize(255)"`
+	Data string `binding:"Required;MaxSize(65535)"`
+}
+
+func (f *EditVariableForm) Validate(req *http.Request, errs binding.Errors) binding.Errors {
+	ctx := context.GetValidateContext(req)
+	return middleware.Validate(errs, ctx.Data, f, ctx.Locale)
+}
+
 // NewAccessTokenForm form for creating access token
 type NewAccessTokenForm struct {
 	Name  string `binding:"Required;MaxSize(255)"`