test_all: make SMB with Kerberos integration tests run properly

fstest/test_all/config.yaml

@@ -591,6 +591,11 @@ backends:
  - backend:  "smb"
    remote:   "TestSMBKerberos:rclone"
    fastlist: false
+   env:
+      - KRB5_CONFIG=/tmp/rclone_krb5/krb5.conf
+      - KRB5CCNAME=/tmp/rclone_krb5/ccache
+   ignoretests:
+     - cmd/gitannex
  - backend:  "storj"
    remote:   "TestStorj:"
    fastlist: true

fstest/testserver/init.d/TestSMBKerberos

@@ -10,10 +10,17 @@ REALM=RCLONE.LOCAL
 SMB_PORT=28633
 KRB5_PORT=28634
 
+# KRB5_CONFIG and KRB5CCNAME should be set by the caller but default
+# them here for the integration tests
+export TEMP_DIR=/tmp/rclone_krb5
+mkdir -p "${TEMP_DIR}"
+export KRB5_CONFIG=${KRB5_CONFIG:-${TEMP_DIR}/krb5.conf}
+export KRB5CCNAME=${KRB5CCNAME:-${TEMP_DIR}/ccache}
+
 . $(dirname "$0")/docker.bash
 
 start() {
-    docker build -t ${IMAGE} - <<EOF
+    docker build -t ${IMAGE} --load - <<EOF
 FROM alpine:3.21
 RUN apk add --no-cache samba-dc
 RUN rm -rf /etc/samba/smb.conf /var/lib/samba \