Improve workflows handling of branches and tags

[cjorge-graphops]

See: https://github.com/graphops/launchpad-charts/actions/runs/5695377935/job/15438430380

Run set -x -e
  set -x -e
  chart_file="charts/main/Chart.yaml"
  sed -E -i 's/^version: [[:digit:]]+.[[:digit:]]+.[[:digit:]]+.*/version: main/' "$chart_file"
  shell: /usr/bin/bash -e {0}
+ chart_file=charts/main/Chart.yaml
+ sed -E -i 's/^version: [[:digit:]]+.[[:digit:]]+.[[:digit:]]+.*/version: main/' charts/main/Chart.yaml
sed: can't read charts/main/Chart.yaml: No such file or directory