Add var project.build.outputTimestamp to enable reproducible builds

 .github/workflows/update-deps.yml

@@ -59,6 +59,7 @@
            -DremotePom='org.keycloak:keycloak-parent:${{ steps.vars.outputs.keycloakVersion }}' \
            -DupdateDependencies=true -DupdatePropertyVersions=true
          mvn versions:use-latest-versions -DallowMajorUpdates=false
          mvn versions:set-property -Dproperty=project.build.outputTimestamp -DnewVersion=`date +%s`

      - id: create_commit
        name: Create commit

 pom.xml

@@ -35,6 +35,7 @@
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
        <maven.compiler.target>1.8</maven.compiler.target>
        <maven.compiler.source>1.8</maven.compiler.source>
        <project.build.outputTimestamp>1656367890</project.build.outputTimestamp>
    </properties>

    <dependencies>