chore: bootstrap Docker development environment

.devcontainer/devcontainer.json

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+{
+  "name": "vacationplanner2ics",
+  "dockerComposeFile": "../compose.yaml",
+  "service": "dev",
+  "workspaceFolder": "/workspace",
+  "shutdownAction": "stopCompose",
+  "customizations": {
+    "vscode": {
+      "extensions": ["rust-lang.rust-analyzer", "tamasfe.even-better-toml"]
+    }
+  },
+  "forwardPorts": [8080]
+}

.dockerignore

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+.git
+.DS_Store
+.env
+.env.*
+target
+*.ics
+*.pem
+*.key
+__pycache__

.gitignore

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+/target/
+/.env
+/.env.*
+!/.env.example
+*.ics
+*.pem
+*.key
+.DS_Store
+__pycache__/

LICENSE

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+MIT License
+
+Copyright (c) 2026 Valentin Popov
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.

compose.yaml

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+services:
+  dev:
+    image: rust:1.98.1-bookworm
+    working_dir: /workspace
+    command: sleep infinity
+    init: true
+    volumes:
+      - .:/workspace
+      - cargo-registry:/usr/local/cargo/registry
+      - cargo-target:/workspace/target
+    ports:
+      - "127.0.0.1:8080:8080"
+
+volumes:
+  cargo-registry:
+  cargo-target:

rust-toolchain.toml

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+[toolchain]
+channel = "1.98.1"
+profile = "minimal"
+components = ["clippy", "rustfmt"]