Update GitHub actions to work in Taskwarrior

This moves the workspace Cargo.toml to the root of the repository, so
that the "actions-rs/cargo" action can find it.

.github/workflows/checks.yml

@@ -0,0 +1,102 @@
+name: checks
+
+on:
+  push:
+    branches:
+      - main
+  pull_request:
+    types: [opened, reopened, synchronize]
+
+jobs:
+  clippy:
+    runs-on: ubuntu-latest
+    name: "Check & Clippy"
+
+    steps:
+      - uses: actions/checkout@v2
+
+      - name: Cache cargo registry
+        uses: actions/cache@v2
+        with:
+          path: ~/.cargo/registry
+          key: ${{ runner.os }}-cargo-registry-${{ hashFiles('**/Cargo.lock') }}
+
+      - name: Cache cargo build
+        uses: actions/cache@v2
+        with:
+          path: target
+          key: ${{ runner.os }}-cargo-build-target-${{ hashFiles('**/Cargo.lock') }}
+
+      - uses: actions-rs/toolchain@v1
+        with:
+          # Fixed version for clippy lints.  Bump this as necesary.  It must not
+          # be older than the MSRV in tests.yml.
+          toolchain: "1.57"
+          override: true
+
+      - uses: actions-rs/cargo@v1.0.1
+        with:
+          command: check
+
+      - run: rustup component add clippy
+
+      - uses: actions-rs/clippy-check@v1
+        with:
+          token: ${{ secrets.GITHUB_TOKEN }}
+          args: --all-features
+          name: "Clippy Results"
+
+  mdbook:
+    runs-on: ubuntu-latest
+    name: "Documentation"
+
+    steps:
+      - uses: actions/checkout@v2
+
+      - name: Setup mdBook
+        uses: peaceiris/actions-mdbook@v1
+        with:
+          # if this changes, change it in cli/Cargo.toml and .github/workflows/publish-docs.yml as well
+          mdbook-version: '0.4.10'
+
+      - name: Cache cargo registry
+        uses: actions/cache@v2
+        with:
+          path: ~/.cargo/registry
+          key: ${{ runner.os }}-cargo-registry-${{ hashFiles('**/Cargo.lock') }}
+
+      - name: Cache cargo build
+        uses: actions/cache@v2
+        with:
+          path: target
+          key: ${{ runner.os }}-cargo-build-target-${{ hashFiles('**/Cargo.lock') }}
+
+      - uses: actions-rs/toolchain@v1
+        with:
+          toolchain: stable
+          override: true
+
+      - name: Create usage-docs plugin
+        run: cargo build -p taskchampion-cli --features usage-docs --bin usage-docs
+
+      - run: mdbook test rust/docs
+      - run: mdbook build rust/docs
+
+  fmt:
+    runs-on: ubuntu-latest
+    name: "Formatting"
+    steps:
+      - uses: actions/checkout@v2
+
+      - uses: actions-rs/toolchain@v1
+        with:
+          profile: minimal
+          components: rustfmt
+          toolchain: stable
+          override: true
+
+      - uses: actions-rs/cargo@v1
+        with:
+          command: fmt
+          args: --all -- --check
+

.github/workflows/publish-docs.yml

@@ -0,0 +1,47 @@
+name: docs
+
+on:
+  push:
+    branches:
+      - main
+
+jobs:
+  mdbook-deploy:
+    runs-on: ubuntu-latest
+
+    steps:
+      - uses: actions/checkout@v1
+
+      - name: Setup mdBook
+        uses: peaceiris/actions-mdbook@v1
+        with:
+          # if this changes, change it in cli/Cargo.toml and .github/workflows/publish-docs.yml as well
+          mdbook-version: '0.4.10'
+
+      - name: Cache cargo registry
+        uses: actions/cache@v2
+        with:
+          path: ~/.cargo/registry
+          key: ${{ runner.os }}-cargo-registry-${{ hashFiles('**/Cargo.lock') }}
+
+      - name: Cache cargo build
+        uses: actions/cache@v2
+        with:
+          path: target
+          key: ${{ runner.os }}-cargo-build-target-${{ hashFiles('**/Cargo.lock') }}
+
+      - uses: actions-rs/toolchain@v1
+        with:
+          toolchain: stable
+          override: true
+
+      - name: Create usage-docs plugin
+        run: cargo build -p taskchampion-cli --features usage-docs --bin usage-docs
+
+      - run: mdbook build docs
+
+      - name: Deploy
+        uses: peaceiris/actions-gh-pages@v3
+        with:
+          github_token: ${{ secrets.GITHUB_TOKEN }}
+          publish_dir: ./docs/book

.github/workflows/rust-tests.yml

@@ -0,0 +1,47 @@
+name: tests - rust
+
+on:
+  push:
+    branches:
+      - main
+  pull_request:
+    types: [opened, reopened, synchronize]
+
+jobs:
+  test:
+    strategy:
+      matrix:
+        rust:
+          # MSRV; most not be higher than the clippy rust version in checks.yml
+          - "1.47"
+          - "stable"
+        os:
+          - ubuntu-latest
+          - macOS-latest
+          - windows-latest
+
+    name: "rust ${{ matrix.rust }} on ${{ matrix.os }}"
+    runs-on: ${{ matrix.os }}
+
+    steps:
+      - uses: actions/checkout@v1
+
+      - name: Cache cargo registry
+        uses: actions/cache@v2
+        with:
+          path: ~/.cargo/registry
+          key: ${{ runner.os }}-${{ matrix.rust }}-cargo-registry-${{ hashFiles('**/Cargo.lock') }}
+
+      - name: Cache cargo build
+        uses: actions/cache@v2
+        with:
+          path: target
+          key: ${{ runner.os }}-${{ matrix.rust }}-cargo-build-target-${{ hashFiles('**/Cargo.lock') }}
+
+      - uses: actions-rs/toolchain@v1
+        with:
+          toolchain: "${{ matrix.rust }}"
+          override: true
+
+      - name: test
+        run: cargo test

.github/workflows/security.yml

@@ -0,0 +1,19 @@
+name: security
+
+on:
+  schedule:
+    - cron: '0 0 * * *'
+  push:
+    paths:
+      - '**/Cargo.toml'
+      - '**/Cargo.lock'
+
+jobs:
+  audit:
+    runs-on: ubuntu-latest
+    name: "Audit Dependencies"
+    steps:
+      - uses: actions/checkout@v2
+      - uses: actions-rs/audit-check@v1
+        with:
+          token: ${{ secrets.GITHUB_TOKEN }}