add release workflow

Signed-off-by: Jason Hall <jason@chainguard.dev>

.github/workflows/release.yaml

@@ -0,0 +1,49 @@
+name: Release
+
+on:
+  release:
+    types: [published]
+
+env:
+  CARGO_TERM_COLOR: always
+
+jobs:
+  publish:
+    name: Publish to crates.io
+    runs-on: ubuntu-latest
+    permissions:
+      id-token: write
+    steps:
+    - uses: actions/checkout@08c6903cd8c0fde910a37f88322edcfb5dd907a8 # v5.0.0
+    - uses: dtolnay/rust-toolchain@6d653acede28d24f02e3cd41383119e8b1b35921 # master
+      with:
+        toolchain: stable
+
+    - name: Cache cargo registry
+      uses: actions/cache@0057852bfaa89a56745cba8c7296529d2fc39830 # v4
+      with:
+        path: ~/.cargo/registry
+        key: ${{ runner.os }}-cargo-registry-${{ hashFiles('**/Cargo.lock') }}
+
+    - name: Cache cargo index
+      uses: actions/cache@0057852bfaa89a56745cba8c7296529d2fc39830 # v4
+      with:
+        path: ~/.cargo/git
+        key: ${{ runner.os }}-cargo-index-${{ hashFiles('**/Cargo.lock') }}
+
+    - name: Verify version matches tag
+      run: |
+        CARGO_VERSION=$(cargo metadata --no-deps --format-version 1 | jq -r '.packages[0].version')
+        TAG_VERSION=${GITHUB_REF#refs/tags/v}
+        if [ "$CARGO_VERSION" != "$TAG_VERSION" ]; then
+          echo "Version mismatch: Cargo.toml has $CARGO_VERSION, but tag is $TAG_VERSION"
+          exit 1
+        fi
+
+    - run: cargo test --verbose
+
+    - uses: rust-lang/crates-io-auth-action@041cce5b4b821e6b0ebc9c9c38b58cac4e34dcc2 # v1.0.2
+      id: auth
+    - run: cargo publish
+      env:
+        CARGO_REGISTRY_TOKEN: ${{ steps.auth.outputs.token }}

Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "krust"
-version = "0.1.0"
+version = "0.0.1"
 edition = "2021"
 authors = ["Jason Hall <imjasonh@gmail.com>"]
 description = "A container image build tool for Rust applications"