Add release archive workflow (#10)

Copied off of
https://github.com/bazel-ios/rules_ios/blob/master/.github/workflows/create_release.yml

Signed-off-by: Matt Robinson <[email protected]>

.github/workflows/create_release.yml

@@ -0,0 +1,46 @@
+name: Create Release
+
+on:
+  workflow_dispatch:
+    inputs:
+      tag:
+        description: 'The new version to tag, ex: x.x.x'
+        required: true
+        type: string
+
+jobs:
+  create-release:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v3
+      - name: Create Release
+        run: |
+          set -euo pipefail
+
+          git config user.name "Release Workflow"
+          git config user.email "[email protected]"
+
+          # Archive the repository
+          COPYFILE_DISABLE=1 tar czvf "swift-bep-parser.$TAG.tar.gz" \
+            --exclude="./bazel-*" \
+            --exclude="user.bazelrc" \
+            --exclude=".DS_Store" \
+            --exclude="*.xcodeproj" \
+            --exclude="Tests/" \
+            --exclude="README.md" \
+            ./*
+
+          # Create the release notes
+          ./.github/workflows/generate_release_notes.sh "$TAG" | tee notes.md
+
+          # Create the release
+          gh release create "$TAG" \
+            --title "$TAG" \
+            --target "$GITHUB_REF_NAME" \
+            --generate-notes \
+            --notes-file notes.md \
+            "rules_ios.$TAG.tar.gz"
+        env:
+          TAG: ${{ inputs.tag }}
+          GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}

.github/workflows/generate_release_notes.sh

@@ -0,0 +1,22 @@
+#!/bin/bash
+
+set -exuo pipefail
+
+# This script generates release notes for a release.
+# It uses the new tag and archive to generate a workspace snippet.
+# It is primarily used by the `create_release.yml` workflow.
+# Args:
+#  - The first argument is the new version number.
+
+readonly new_version=$1
+readonly release_archive="swift-bep-parser.$new_version.tar.gz"
+
+sha=$(shasum -a 256 "$release_archive" | cut -d " " -f1)
+
+cat <<EOF
+### Bzlmod Snippet
+
+\`\`\`bzl
+bazel_dep(name = "swift_bep_parser", version = "$new_version")
+\`\`\`
+EOF