chore(ci): improve repository maintenance configuration

- Enable weekly Dependabot updates for GitHub Actions dependencies
- Consolidate duplicate Trivy scans into a single SARIF scan with exit-code gate
- Ignore macOS metadata and locally downloaded drone-ssh binaries
- Add feature request issue template and pull request checklist template

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

.github/ISSUE_TEMPLATE/feature_request.md

@@ -0,0 +1,36 @@
+---
+name: Feature request
+about: Suggest an idea for this action
+title: ""
+labels: enhancement
+assignees: appleboy
+---
+
+## Is your feature request related to a problem?
+
+A clear and concise description of what the problem is. Ex. I'm always frustrated when [...]
+
+## Describe the solution you'd like
+
+A clear and concise description of what you want to happen.
+
+## Example Yaml Config
+
+If applicable, show how you would expect to use the new feature:
+
+```yaml
+- name: executing remote ssh commands
+  uses: appleboy/ssh-action@v1
+  with:
+    host: ${{ secrets.HOST }}
+    username: ${{ secrets.USERNAME }}
+    key: ${{ secrets.KEY }}
+    script: whoami
+```
+
+## Additional context
+
+Add any other context about the feature request here. Note that SSH connection
+behavior (ciphers, timeouts, proxy, etc.) is implemented in
+[drone-ssh](https://github.com/appleboy/drone-ssh) - feature requests for
+connection behavior may belong there.

.github/PULL_REQUEST_TEMPLATE.md

@@ -0,0 +1,14 @@
+## Description
+
+Please describe what this PR changes and why.
+
+## Related Issues
+
+Fixes #
+
+## Checklist
+
+- [ ] Tests pass (`.github/workflows/main.yml` scenarios cover this change)
+- [ ] `action.yml` input descriptions updated (if adding/changing parameters)
+- [ ] README.md parameter tables updated (if adding/changing parameters)
+- [ ] Chinese translations updated (README.zh-cn.md, README.zh-tw.md)

.github/dependabot.yml

@@ -0,0 +1,10 @@
+version: 2
+updates:
+  - package-ecosystem: "github-actions"
+    directory: "/"
+    schedule:
+      interval: "weekly"
+    labels:
+      - "dependencies"
+    commit-message:
+      prefix: "chore(ci)"

.github/workflows/trivy-scan.yml

@@ -33,19 +33,10 @@ jobs:
           format: 'sarif'
           output: 'trivy-results.sarif'
           severity: 'CRITICAL,HIGH,MEDIUM'
+          exit-code: '1'
 
       - name: Upload Trivy results to GitHub Security tab
         uses: github/codeql-action/upload-sarif@v4
         if: always()
         with:
           sarif_file: 'trivy-results.sarif'
-
-      - name: Run Trivy vulnerability scanner (table format)
-        uses: aquasecurity/trivy-action@v0.36.0
-        with:
-          scan-type: 'fs'
-          scan-ref: '.'
-          scanners: 'vuln,secret,misconfig'
-          format: 'table'
-          severity: 'CRITICAL,HIGH,MEDIUM'
-          exit-code: '1'

.gitignore

@@ -0,0 +1,6 @@
+# macOS
+.DS_Store
+
+# drone-ssh binaries downloaded by entrypoint.sh during local testing
+drone-ssh-*
+checksums.txt