Adding actions for generating and publishing a release

The generate-release action is a manual dispatch action that takes
the version number as an input, and depending on the major version,
will checkout either main or main_1.x, then merge either develop or
develop_1.x into it, bump all the version strings in the repo, and
raise a PR against main or main_1.x.

The publish-release action runs on merge to main or main_1.x and
reads the version from the version.txt file to determine the
release tag it should publish, then publishes that release.

NOTE: both of these actions are broken in v2 of the repo until we
bring it up to date with the Swift Package Manager support changes,
as the version.txt file does not exist in develop currently.

.github/workflows/generate-release.yml

@@ -0,0 +1,87 @@
+name: Generate Release
+run-name: Generate Release ${{ fromJSON(inputs.major) }}.${{ fromJSON(inputs.minor) }}.${{ fromJSON(inputs.patch) }}
+
+on:
+  workflow_dispatch:
+    inputs:
+      major:
+        description: 'Major version'
+        required: true
+        default: '1'
+        type: choice
+        options:
+          - '1'
+          - '2'
+      minor:
+        description: 'Minor version'
+        required: true
+        type: number
+      patch:
+        description: 'Patch version'
+        required: true
+        type: number
+
+jobs:
+  bump-version-and-raise-pr:
+    runs-on: ubuntu-latest
+    permissions:
+      contents: write
+      pull-requests: write
+    env:
+      version: ${{ fromJSON(inputs.major) }}.${{ fromJSON(inputs.minor) }}.${{ fromJSON(inputs.patch) }}
+      branch: ${{ inputs.major == 2 && 'develop' || 'develop_1.x' }}
+      target: ${{ inputs.major == 2 && 'main' || 'main_1.x' }}
+    steps:
+      - name: Check minor has no decimals
+        run: ${{ !contains(fromJSON(inputs.minor), '.') }}
+
+      - name: Check patch has no decimals
+        run: ${{ !contains(fromJSON(inputs.patch), '.') }}
+
+      - name: Checkout ${{ env.target }}
+        uses: actions/checkout@v4
+        with:
+          ref: ${{ env.target }}
+          fetch-depth: 0
+
+      - name: Ensure tag does not exist
+        run: |
+          if git show-ref --tags --verify --quiet "refs/tags/$version"; then
+            echo "::error::Tag $version exists" && exit 1
+          else
+            echo "Tag $version does not exist"
+          fi
+
+      - name: Ensure branch does not exist
+        run: |
+          if git show-ref --verify --quiet "refs/remotes/origin/release/$version"; then
+            echo "::error::Release branch release/$version exists" && exit 1
+          else
+            echo "Release branch release/$version does not exist"
+          fi
+
+      - name: Merge in ${{ env.branch }}
+        run: |
+          git config user.name github-actions
+          git config user.email [email protected]
+          git merge origin/${{ env.branch }}
+      
+      - name: Update version in txt file
+        run: sed -i "s/[0-9]\{1,\}\.[0-9]\{1,\}\.[0-9]\{1,\}/$version/" ./mambaSharedFramework/Resources/version.txt
+
+      - name: Update version in xcodeproj file
+        run: sed -i "s/MARKETING_VERSION = [0-9]\{1,\}\.[0-9]\{1,\}\.[0-9]\{1,\};/MARKETING_VERSION = $version;/" ./mamba.xcodeproj/project.pbxproj
+
+      - name: Update version in podspec file
+        run: sed -i "s/= \"[0-9]\{1,\}\.[0-9]\{1,\}\.[0-9]\{1,\}\"/= \"$version\"/" ./mamba.podspec
+
+      - name: Create pull request
+        uses: peter-evans/create-pull-request@v7
+        with:
+          title: Release ${{ env.version }}
+          commit-message: Bump version to ${{ env.version }}
+          branch: release/${{ env.version }}
+          body: |
+            Automated version bump to ${{ env.version }} generated by [create-pull-request][1].
+            
+            [1]: https://github.com/peter-evans/create-pull-request

.github/workflows/publish-release.yml

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+name: Publish Release
+on:
+  push:
+    branches:
+      - 'main'
+      - 'main_1.x'
+
+jobs:
+  get-version:
+    name: Get version for release
+    runs-on: ubuntu-latest
+    outputs:
+      version: ${{ steps.version.outputs.version }}
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+      - id: version
+        run: echo "version=`cat ./mambaSharedFramework/Resources/version.txt`" >> "$GITHUB_OUTPUT"
+
+  publish-release:
+    name: Publish release ${{ needs.get-version.outputs.version }}
+    runs-on: ubuntu-latest
+    needs: get-version
+    permissions:
+      contents: write
+    steps:
+      - uses: actions/checkout@v4
+      - name: Create release
+        uses: elgohr/Github-Release-Action@v5
+        env:
+          GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+        with:
+          title: ${{ needs.get-version.outputs.version }}
+          tag: ${{ needs.get-version.outputs.version }}