VeraCrypt release docs: Fix distribution name (refs: #15524)

wiki/src/contribute/release_process/veracrypt.mdwn

@@ -30,6 +30,9 @@ If any of these have a new version in stretch or stretch-security:
        NEW_VERSION=2.1.8-2
        # Release the updated package should go in (stable, testing or devel)
        RELEASE=stable
+       # The topic branch for this update
+       BRANCH=feature/update-udisks
+       SUITE=$(echo ${BRANCH} | sed -e 's,[^.a-z0-9-],-,ig'  | tr '[A-Z]' '[a-z]')
 
        sudo tee /etc/apt/sources.list.d/tails.list <<EOF
        deb-src tor+http://jenw7xbd6tf7vfhp.onion/ ${RELEASE} main
@@ -54,9 +57,7 @@ If any of these have a new version in stretch or stretch-security:
    in a Stretch/amd64 chroot:
 
        cd ${PACKAGE_NAME}*/
-       # Set the distribution field to the name of the branch that will bring
-       # the update (without "bugfix/" or "feature/")
-       debchange -i
+       debchange -i --distribution=${SUITE} --force-distribution
        pdebuild
 
 1. Install the newly built package in the build environment and rebuild all