WIP setup Github CI

.github/ISSUE_TEMPLATE/1-problem.md

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+---
+name: Problem
+about: Something does not seem right
+
+---
+
+

.github/ISSUE_TEMPLATE/2-suggestion.md

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+---
+name: Suggestion
+about: Share how Serde could support your use case better
+
+---
+
+

.github/ISSUE_TEMPLATE/3-documentation.md

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+---
+name: Documentation
+about: Certainly there is room for improvement
+
+---
+
+

.github/ISSUE_TEMPLATE/4-other.md

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+---
+name: Anything else!
+about: Whatever is on your mind
+
+---
+
+

.github/workflows/ci.yml

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+name: CI
+
+on:
+  push:
+  pull_request:
+  workflow_dispatch:
+  schedule: [cron: "40 1 * * *"]
+
+permissions:
+  contents: read
+
+env:
+  RUSTFLAGS: -Dwarnings
+
+jobs:
+  test:
+    name: Test suite
+    runs-on: ubuntu-latest
+    timeout-minutes: 45
+    steps:
+      - uses: actions/checkout@v4
+      - uses: dtolnay/rust-toolchain@nightly
+      - run: cd test_suite && cargo test --features unstable
+      - uses: actions/upload-artifact@v4
+        if: always()
+        with:
+          name: Cargo.lock
+          path: Cargo.lock
+
+  stable:
+    name: Rust ${{matrix.rust}}
+    runs-on: ubuntu-latest
+    strategy:
+      fail-fast: false
+      matrix:
+        rust: [stable, beta]
+    timeout-minutes: 45
+    steps:
+      - uses: actions/checkout@v4
+      - uses: dtolnay/rust-toolchain@master
+        with:
+          toolchain: ${{matrix.rust}}
+      - run: cargo build
+
+  nightly:
+    name: Rust nightly ${{matrix.os == 'windows' && '(windows)' || ''}}
+    runs-on: ${{matrix.os}}-latest
+    strategy:
+      fail-fast: false
+      matrix:
+        os: [ubuntu]
+    timeout-minutes: 45
+    steps:
+      - uses: actions/checkout@v4
+      - uses: dtolnay/rust-toolchain@nightly
+      - run: cargo build
+
+  doc:
+    name: Documentation
+    runs-on: ubuntu-latest
+    timeout-minutes: 45
+    env:
+      RUSTDOCFLAGS: -Dwarnings
+    steps:
+      - uses: actions/checkout@v4
+      - uses: dtolnay/rust-toolchain@nightly
+      - uses: dtolnay/install@cargo-docs-rs
+      - run: cargo docs-rs
+
+  clippy:
+    name: Clippy
+    runs-on: ubuntu-latest
+    if: github.event_name != 'pull_request'
+    timeout-minutes: 45
+    steps:
+      - uses: actions/checkout@v4
+      - uses: dtolnay/rust-toolchain@clippy
+      - run: cargo clippy --features rc,unstable -- -Dclippy::all -Dclippy::pedantic
+
+  miri:
+    name: Miri
+    runs-on: ubuntu-latest
+    timeout-minutes: 45
+    steps:
+      - uses: actions/checkout@v4
+      - uses: dtolnay/rust-toolchain@miri
+      - run: cargo miri setup
+      - run: cargo miri test