start_for_complement.sh: use more shell builtins (#18293)

Avoid calling external tools when shell builtins suffice.

### Pull Request Checklist

<!-- Please read
https://element-hq.github.io/synapse/latest/development/contributing_guide.html
before submitting your pull request -->

* [x] Pull request is based on the develop branch
* [x] Pull request includes a [changelog
file](https://element-hq.github.io/synapse/latest/development/contributing_guide.html#changelog).
The entry should:
- Be a short description of your change which makes sense to users.
"Fixed a bug that prevented receiving messages from other servers."
instead of "Moved X method from `EventStore` to `EventWorkerStore`.".
  - Use markdown where necessary, mostly for `code blocks`.
  - End with either a period (.) or an exclamation mark (!).
  - Start with a capital letter.
- Feel free to credit yourself, by adding a sentence "Contributed by
@github_username." or "Contributed by [Your Name]." to the end of the
entry.
* [x] [Code
style](https://element-hq.github.io/synapse/latest/code_style.html) is
correct
(run the
[linters](https://element-hq.github.io/synapse/latest/development/contributing_guide.html#run-the-linters))

---------

Co-authored-by: Quentin Gliech <quenting@element.io>

changelog.d/18293.docker

@@ -0,0 +1 @@
+In start_for_complement.sh, replace some external program calls with shell builtins.

docker/complement/conf/start_for_complement.sh

@@ -9,7 +9,7 @@ echo "  Args: $*"
 echo "  Env: SYNAPSE_COMPLEMENT_DATABASE=$SYNAPSE_COMPLEMENT_DATABASE SYNAPSE_COMPLEMENT_USE_WORKERS=$SYNAPSE_COMPLEMENT_USE_WORKERS SYNAPSE_COMPLEMENT_USE_ASYNCIO_REACTOR=$SYNAPSE_COMPLEMENT_USE_ASYNCIO_REACTOR"
 
 function log {
-    d=$(date +"%Y-%m-%d %H:%M:%S,%3N")
+    d=$(printf '%(%Y-%m-%d %H:%M:%S)T,%.3s\n' ${EPOCHREALTIME/./ })
     echo "$d $*"
 }
 
@@ -103,12 +103,11 @@ fi
 # Note that both the key and certificate are in PEM format (not DER).
 
 # First generate a configuration file to set up a Subject Alternative Name.
-cat > /conf/server.tls.conf <<EOF
+echo "\
 .include /etc/ssl/openssl.cnf
 
 [SAN]
-subjectAltName=DNS:${SERVER_NAME}
-EOF
+subjectAltName=DNS:${SERVER_NAME}" > /conf/server.tls.conf
 
 # Generate an RSA key
 openssl genrsa -out /conf/server.tls.key 2048
@@ -123,8 +122,8 @@ openssl x509 -req -in /conf/server.tls.csr \
   -out /conf/server.tls.crt -extfile /conf/server.tls.conf -extensions SAN
 
 # Assert that we have a Subject Alternative Name in the certificate.
-# (grep will exit with 1 here if there isn't a SAN in the certificate.)
-openssl x509 -in /conf/server.tls.crt -noout -text | grep DNS:
+# (the test will exit with 1 here if there isn't a SAN in the certificate.)
+[[ $(openssl x509 -in /conf/server.tls.crt -noout -text) == *DNS:* ]]
 
 export SYNAPSE_TLS_CERT=/conf/server.tls.crt
 export SYNAPSE_TLS_KEY=/conf/server.tls.key