asterisk-master: Use pjproject from external git repo

By default, asterisk.git build system will fetch pjproject tarball from
https://raw.githubusercontent.com/asterisk/third-party/master/pjproject/$(PJPROJECT_VERSION),
where PJPROJECT_VERSION is defined in asterisk/third-party/versions.mak:
PJPROJECT_VERSION=2.14
On top of that, it applies some patches adapting build system, found in
asterisk/third-party/pjproject/patches/.

The build system also allows to use an out-of-tree pjproject (eg from a
git repo) by symlinking the directory to
asterisk/third-party/pjprojec/source/.

This is all documented in asterisk/third-party/pjproject/README-hacking.md.

Since we want to develop on pjproject too, fetch our own pjproject.git
repo, where we can push changes, and build asterisk using that repo.

Bear in mind that, when asterisk.git builds with out-of-tree pjproject,
it wont apply pjproject patches under asterisk.git/third-party/pjproject/patches.
Hence, I created an "asterisk/2.14" branch in our pjproject.git repo which points
to tag "2.14" (the one used by asterisk 20.7.0, which we use), and has the 2 patches
applied on top.
Then, we have our own "sysmocom/2.14" branch on top of that "asterisk/2.14"
branch, where we put our development. WIP development can also be done  in whatever
branch  on top of "asterisk/2.14" branch.

Change-Id: I73f3323db1b6897fc43215578b0a011fdb6909c5

asterisk-master/Dockerfile

@@ -36,6 +36,17 @@ RUN	useradd -m ${username} && \
 
 WORKDIR	/home/${username}
 
+# clone pjproject
+ARG	PJPROJECT_REMOTE=https://gitea.sysmocom.de/sysmocom/pjproject.git
+ARG	PJPROJECT_BRANCH=sysmocom/2.14
+
+RUN	git clone $PJPROJECT_REMOTE
+ADD	https://gitea.sysmocom.de/api/v1/repos/sysmocom/pjproject/git/refs/heads/$PJPROJECT_BRANCH /tmp/pjproject-ver
+
+RUN	cd pjproject && \
+	git fetch && git checkout $PJPROJECT_BRANCH && \
+	(git symbolic-ref -q HEAD && git reset --hard origin/$PJPROJECT_BRANCH || exit 1); \
+	git rev-parse --abbrev-ref HEAD && git rev-parse HEAD
 
 # clone asterisk
 ARG	ASTERISK_REMOTE=https://gitea.sysmocom.de/sysmocom/asterisk.git
@@ -44,6 +55,10 @@ RUN	git clone $ASTERISK_REMOTE
 RUN	cd asterisk && \
 	git fetch && git checkout -f -B sysmocom/master origin/sysmocom/master
 
+# Use pjproject from git repo above instead of downloading tar.gz:
+RUN	cd asterisk/third-party/pjproject && \
+	ln -s ../../../pjproject/ source
+
 RUN	cd asterisk && \
 	./bootstrap.sh && \
 	./configure && \

make/Makefile

@@ -42,6 +42,7 @@ OSMO_SIP_BRANCH?=master
 OSMO_STP_BRANCH?=master
 OSMO_UECUPS_BRANCH?=master
 OPEN5GS_BRANCH?=main
+PJPROJECT_BRANCH?=sysmocom/2.14
 BUILD_ARGS?=
 RUN_ARGS?=-it
 UPSTREAM_DISTRO?=debian:bookworm
@@ -125,6 +126,7 @@ docker-build: .release
 		--build-arg OSMO_STP_BRANCH=$(OSMO_STP_BRANCH) \
 		--build-arg OSMO_UECUPS_BRANCH=$(OSMO_UECUPS_BRANCH) \
 		--build-arg OPEN5GS_BRANCH=$(OPEN5GS_BRANCH) \
+		--build-arg PJPROJECT_BRANCH=$(PJPROJECT_BRANCH) \
 		$(BUILD_ARGS) -t $(IMAGE):latest .
 	@DOCKER_MAJOR=$(shell docker -v | sed -e 's/.*version //' -e 's/,.*//' | cut -d\. -f1) ; \
 	DOCKER_MINOR=$(shell docker -v | sed -e 's/.*version //' -e 's/,.*//' | cut -d\. -f2) ; \