add custom TAL installer patch

deploy/docker-installer/custom-tal-patch/custom-tal.env.example

@@ -0,0 +1,15 @@
+# Copy these values into the component .env after applying the patch.
+# The patch's --enable-custom option writes the same values automatically.
+RIRS=custom
+TAL_INPUT_MODE=custom-file-with-ta
+CUSTOM_FIXTURE_HOST_DIR=../custom-fixtures
+CUSTOM_TAL_PATH=/opt/ours-rp/custom-fixtures/tal/custom.tal
+CUSTOM_TA_PATH=/opt/ours-rp/custom-fixtures/ta/custom-ta.cer
+CUSTOM_TAL_URI=https://host.docker.internal:18443/tal/custom.tal
+HTTP_ROOT_CERT_PATHS=/opt/ours-rp/custom-fixtures/certs/rrdp-ca.pem
+
+# Recommended for a finite acceptance run; keep the customer default for a
+# long-running test only after the fixture service is supervised.
+MAX_RUNS=1
+INTERVAL_SECS=0
+SOAK_RESTART_POLICY=no