License check action (#1384)

* Add scripts + support docs for license check action

* Switch to genuine bash

.github/workflows/license-check/license-check.sh

@@ -0,0 +1,49 @@
+#!/bin/bash
+IFS=$'\n'
+
+readarray -t whitelist < ./.github/workflows/license-check/license-whitelist.txt
+readarray -t specialcases < <( grep -vE "^#" ./.github/workflows/license-check/license-special-cases.txt )
+
+exitStatus=0
+
+for specialcase in "${specialcases[@]}"
+do
+    echo "Special case: " "$specialcase"
+done
+
+readarray -t thirdparty < <( tail -n +3 ./target/generated-sources/license/THIRD-PARTY.txt )
+for thirdpartyentry in "${thirdparty[@]}"
+do   
+    allLicensesValid=true
+    # Remove leading spaces
+    thirdpartyentry="${thirdpartyentry#"${thirdpartyentry%%[![:space:]]*}"}"
+    echo "Evaluating Dependency: " "$thirdpartyentry"
+    if [[ $(echo "${specialcases[@]}" | fgrep -w $thirdpartyentry) ]]
+    then
+        echo "  Ignoring: " "$thirdpartyentry"
+    else
+        licenses=($(echo $thirdpartyentry | awk -vRS=")" -vFS="(" '{print $2}'))
+        for (( i=0;  i < ${#licenses[@]} - 1 ; i++ ))
+        do
+            #echo ${licenses[i]}
+            licenseToCheck=${licenses[i]}
+            if [[ $(echo "${whitelist[@]}" | fgrep -w $licenseToCheck) ]]
+            then
+                #do nothing bsh no-op
+                :
+            else
+                echo "  Unknown license found: " $licenseToCheck
+                allLicensesValid=false
+                exitStatus=1
+            fi
+        done
+    fi
+    if $allLicensesValid 
+    then
+        echo "  All licenses OK"
+    else
+        echo "  Possible license incompatibilities found"
+    fi
+done
+
+exit $exitStatus

.github/workflows/license-check/license-special-cases.txt

@@ -0,0 +1,3 @@
+(Unknown license) javaparser (com.google.code.javaparser:javaparser:1.0.11 - http://code.google.com/p/javaparser/)
+# IGNORE ME
+(Apache Software License 2.0) HAPI FHIR - Validation Resources (FHIR R4) (ca.uhn.hapi.fhir:hapi-fhir-validation-resources-r4:6.4.1 - https://hapifhir.io/hapi-deployable-pom/hapi-fhir-validation-resources-r4)

.github/workflows/license-check/license-whitelist.txt

@@ -0,0 +1,25 @@
+The Apache Software License, Version 2.0
+Apache Software License, version 1.1
+Apache Software License 2.0
+The Apache License, Version 2.0
+The Apache Software License, Version 2.0
+MIT License
+The MIT License
+Apache Software License, version 1.1
+Apache 2
+Apache 2.0
+Apache License 2.0
+Eclipse Public License v2.0
+BSD licence
+The BSD License
+BSD-Style License
+BSD License 3
+New BSD License
+BSD 3 Clause
+The JSON License
+Eclipse Public License - v 1.0
+Eclipse Public License v. 2.0
+Eclipse Distribution License v. 1.0
+Eclipse Distribution License - v 1.0
+Unicode/ICU License
+BSD 2-Clause License