chore: fix publish CI

[techouse]

Added

on:
  push:
    tags:
      - 'v[0-9]+.[0-9]+.[0-9]+*'

so that a tag like that can also trigger a release.

Additionally I added the check

- name: Compare version with ref/tag
  id: compare_version_with_tag
  run: |
    set -e
    TAG=${GITHUB_REF_NAME#v}
    if [[ "$VERSION" != "$TAG" ]]; then
      echo "Version in ${{ matrix.package }}/pubspec.yaml ($VERSION) does not match tag ($TAG)"
      echo "Skipping publish for ${{ matrix.package }}"
      echo "SHOULD_RUN=0" >> $GITHUB_ENV
    else
      echo "SHOULD_RUN=1" >> $GITHUB_ENV
    fi

[techouse]

@petercinibulk can you please take a look at this once you get the time? :)