Add Docker development environment and initial configuration files (#1)

* Add Docker development environment and initial configuration files

* Update VSCode settings, add CODEOWNERS, pull request template, and Prettier configuration

* Configure super-linter to trigger on pushes to the main branch

* Replace Docker image verification workflow with Devcontainer image scanning workflow

* Refine CODEOWNERS file, update Devcontainer verification workflow permissions, and adjust Prettier configuration

* Exclude devcontainer Dockerfile from super-linter validation

* Update super-linter configuration to exclude additional files from validation

* Refactor workflow files for consistency and clarity in Devcontainer and super-linter configurations

Author: Vianpyro

.devcontainer/Dockerfile

@@ -0,0 +1,16 @@
+FROM alpine:latest
+
+# Install common tools
+RUN apk add --no-cache bash git \
+    postfix
+
+# Setup default user
+ARG USERNAME=vscode
+ARG USER_UID=1000
+ARG USER_GID=$USER_UID
+
+RUN addgroup -g $USER_GID -S $USERNAME && \
+    adduser -u $USER_UID -S -G $USERNAME -s /bin/bash $USERNAME
+
+# Switch to the default user
+USER $USERNAME

.devcontainer/devcontainer.json

@@ -0,0 +1,10 @@
+{
+    "name": "Postfix Development Container",
+    "dockerFile": "Dockerfile",
+    "customizations": {
+        "settings": {
+            "terminal.integrated.shell.linux": "/bin/bash"
+        }
+    },
+    "remoteUser": "vscode"
+}

.github/CODEOWNERS

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+# Default owner(s) for everything in the repository
+*   @Vianpyro

.github/pull_request_template.md

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+## Description
+
+- A clear and concise description of the changes introduced in this pull request.
+
+## Related Issues
+
+- Closes #ISSUE_NUMBER (if applicable)
+
+## Changes Made
+
+- List the main changes made in this PR:
+  - [ ] Change 1
+  - [ ] Change 2
+  - [ ] Change 3
+
+## Screenshots (if applicable)
+
+- If applicable, add screenshots to help visualize the changes.
+
+## How to Test
+
+- Steps to test the changes:
+
+1. Go to '...'
+2. Click on '....'
+3. Observe '....'
+
+## Checklist
+
+- [ ] My code follows the project's coding style.
+- [ ] I have performed a self-review of my code.
+- [ ] I have added necessary tests (if applicable).
+- [ ] I have documented my changes (if necessary).
+
+## Additional Context
+
+- Add any other relevant context or notes for reviewers.

.github/workflows/devcontainer-verification.yml

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+---
+name: Scan Devcontainer Image
+
+on:
+  push:
+    branches:
+      - main
+  pull_request: null
+
+permissions: {}
+
+jobs:
+  scan-devcontainer:
+    name: Scan Devcontainer Image
+
+    permissions:
+      actions: read
+      security-events: write
+
+    uses: Vianpyro/Template/.github/workflows/docker-image-verification.yml@main
+    with:
+      image_name: devcontainer
+      dockerfile_path: ./Dockerfile
+      context: .devcontainer

.github/workflows/super-linter.yml

@@ -0,0 +1,33 @@
+---
+name: Lint
+
+on:
+  push:
+    branches:
+      - main
+  pull_request: null
+
+permissions: {}
+
+jobs:
+  build:
+    name: Lint
+    runs-on: ubuntu-latest
+
+    permissions:
+      contents: read
+      packages: read
+      statuses: write
+
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v4
+        with:
+          fetch-depth: 0
+
+      - name: Super-linter
+        uses: super-linter/super-linter@v7
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+          VALIDATE_ALL_CODEBASE: false
+          FILTER_REGEX_EXCLUDE: '(.devcontainer/Dockerfile|.github/pull_request_template.md|.github/ISSUE_TEMPLATE/*.md)'

.gitignore

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+config/sasl_passwd
+config/sasl_passwd.db
+.env

.prettierignore

@@ -0,0 +1 @@
+CODEOWNERS

.prettierrc

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+{
+    "printWidth": 80,
+    "tabWidth": 4,
+    "trailingComma": "es5",
+    "useTabs": false,
+    "semi": false,
+    "singleQuote": true,
+    "overrides": [
+        {
+            "files": ["*.yml", "*.yaml", "*.md"],
+            "options": {
+                "tabWidth": 2
+            }
+        }
+    ]
+}

.vscode/settings.json

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+{
+    "editor.defaultFormatter": "esbenp.prettier-vscode",
+    "editor.formatOnSave": true,
+    "editor.insertSpaces": true,
+    "editor.tabSize": 4,
+    "files.insertFinalNewline": true,
+    "files.trimFinalNewlines": true,
+    "files.trimTrailingWhitespace": false,
+    "[yaml]": {
+        "editor.tabSize": 2
+    }
+}