Allow to build apache-airflow documentation from branch rather than tag

We sometimes want to build airflow docs from tip of the branch - and in
this case we should be able to override the version we are building
rather than deriving it from the TAG.

Author: potiuk

.github/workflows/publish-docs-to-s3.yml

@@ -52,7 +52,14 @@ on:  # yamllint disable-line rule:truthy
         required: false
         default: false
         type: boolean
-
+      airflow-base-version:
+        required: false
+        description: "Override the Airflow Base Version to use for the docs build"
+        type: string
+      airflow-version:
+        required: false
+        description: "Override the Airflow Version to use for the docs build"
+        type: string
 permissions:
   contents: read
 jobs:
@@ -69,6 +76,8 @@ jobs:
       DESTINATION: ${{ inputs.destination }}
       SKIP_WRITE_TO_STABLE_FOLDER: ${{ inputs.skip-write-to-stable-folder }}
       BUILD_SBOMS: ${{ inputs.build-sboms }}
+      AIRFLOW_BASE_VERSION: ${{ inputs.airflow-base-version || '' }}
+      AIRFLOW_VERSION: ${{ inputs.airflow-version || '' }}
     outputs:
       include-docs: ${{ inputs.include-docs == 'all' && '' || inputs.include-docs }}
       destination-location: ${{ steps.parameters.outputs.destination-location }}
@@ -102,6 +111,8 @@ jobs:
           echo "Destination: '${DESTINATION}'"
           echo "Skip write to stable folder: '${SKIP_WRITE_TO_STABLE_FOLDER}'"
           echo "Build SBOMs: '${BUILD_SBOMS}'"
+          echo "Airflow Base Version: '${AIRFLOW_BASE_VERSION}'"
+          echo "Airflow Version: '${AIRFLOW_VERSION}'"
           if [[ "${DESTINATION}" == "auto" ]]; then
              if [[ "${REF}" =~ ^.*[0-9]*\.[0-9]*\.[0-9]*$ ]]; then
                 echo "${REF} looks like final release, using live destination"
@@ -118,8 +129,20 @@ jobs:
              echo "destination-location=s3://staging-docs-airflow-apache-org/docs/" >> ${GITHUB_OUTPUT}
           fi
           if [[ " ${INCLUDE_DOCS} " =~ " apache-airflow " ]]; then
-             AIRFLOW_BASE_VERSION=$(echo "${REF}" | grep -oE '[0-9]+\.[0-9]+\.[0-9]+')
-             AIRFLOW_VERSION="${REF}"
+             if [[ ${AIRFLOW_BASE_VERSION=} == "" && ${AIRFLOW_VERSION=} == "" ]]; then
+                echo "No Airflow Versions provided, using ${REF} to determine it."
+                AIRFLOW_VERSION="${REF}"
+                set +e
+                AIRFLOW_BASE_VERSION=$(echo "${REF}" | grep -oE '[0-9]+\.[0-9]+\.[0-9]+')
+                set -e
+                if [[ ${AIRFLOW_BASE_VERSION=} == "" ]]; then
+                   echo
+                   echo "No Airflow Base Version found in ${REF}"
+                   echo "You need to force airflow version and airflow base version in the workflow."
+                   echo
+                   exit 1
+                fi
+             fi
              echo "airflow-base-version=${AIRFLOW_BASE_VERSION}" >> ${GITHUB_OUTPUT}
              echo "airflow-version=${AIRFLOW_VERSION}" >> ${GITHUB_OUTPUT}
           else