Get the increment level to the new semver

Signed-off-by: Kyle Harding <kyle@balena.io>

flowzone.yml

@@ -1199,7 +1199,8 @@ jobs:
         run: |
           npm install -g \
             balena-versionist@~0.15.0 \
-            versionist@^7.0.3
+            versionist@^7.0.3 \
+            semver@^7.7.1
 
           npm ls -g
 
@@ -1213,6 +1214,34 @@ jobs:
             "$(npm root -g)"/versionist/scripts/generate-changelog.sh .
           fi
 
+      # Get the current version with versionist.
+      # Note that this does NOT include the config generated by the balena-versionist wrapper.
+      # Is that going to be a problem for any project types?
+      - name: Get current version
+        uses: actions/github-script@60a0d83039c74a4aee543508d2ffcb1c3799cdea # v7
+        if: inputs.disable_versioning != true
+        id: current_version
+        with:
+          result-encoding: json
+          script: |
+            const path = require('path');
+            const { execSync } = require('child_process');
+
+            const runPath = process.env.GITHUB_WORKSPACE;
+
+            let version;
+            try {
+              version = await execSync('versionist get version', {
+                cwd: runPath,
+              });
+              version = version.toString().trim();
+            } catch (e) {
+              core.setFailed(e.message);
+            }
+
+            console.log('Current version: ', version);
+            return version;
+
       # https://github.com/actions/github-script
       - name: Run balena-versionist
         uses: actions/github-script@60a0d83039c74a4aee543508d2ffcb1c3799cdea # v7
@@ -1247,6 +1276,29 @@ jobs:
             core.setOutput('tag', `v${version}`);
             return version;
 
+      # https://github.com/actions/github-script
+      - name: Tag increment level
+        uses: actions/github-script@60a0d83039c74a4aee543508d2ffcb1c3799cdea # v7
+        if: inputs.disable_versioning != true
+        id: increment
+        env:
+          PREVIOUS_VERSION: ${{ steps.current_version.outputs.version }}
+          NEW_VERSION: ${{ steps.versionist.outputs.semver }}
+        with:
+          result-encoding: json
+          script: |
+            const path = require('path');
+            const { execSync } = require('child_process');
+
+            // Get global node_modules path
+            const globalNodeModules = execSync('npm root -g').toString().trim();
+            const semver = require(path.join(globalNodeModules, 'semver'));
+
+            const increment = semver.diff(process.env.PREVIOUS_VERSION, process.env.NEW_VERSION);
+
+            console.log('Increment: ', increment);
+            return increment;
+
       # https://github.com/orgs/community/discussions/50055
       # https://www.levibotelho.com/development/commit-a-file-with-the-github-api/
       # https://octokit.github.io/rest.js/v21/#git-create-blob