oauth2-client: migrate apps to use oauth2-client helm chart (#90)

* headscale: use oauth2-client helm chart

* pihole: use oauth2-client helm chart

* matrix: use oauth2-client helm chart

* oauth2: pass issuer address to pihole, headscale and matrix apps

* pihole: fix secret name

* matrix: fix version to v1.98.0

* headscale: make oauth2-client depend on auth release

---------

Co-authored-by: Giorgi Lekveishvili <lekva@gl-mbp-m1-max.local>
diff --git a/core/installer/Makefile b/core/installer/Makefile
index acc96c9..1c83138 100644
--- a/core/installer/Makefile
+++ b/core/installer/Makefile
@@ -1,5 +1,8 @@
 repo_name ?= dtabidze
 podman ?= docker
+ifeq ($(podman), podman)
+manifest_dest=docker://docker.io/$(repo_name)/pcloud-installer:latest
+endif
 
 clean:
 	rm -rf tmp
@@ -70,5 +73,5 @@
 
 push: push_arm64 push_amd64
 	$(podman) manifest create $(repo_name)/pcloud-installer:latest $(repo_name)/pcloud-installer:arm64 $(repo_name)/pcloud-installer:amd64
-	$(podman) manifest push $(repo_name)/pcloud-installer:latest 
+	$(podman) manifest push $(repo_name)/pcloud-installer:latest $(manifest_dest)
 	$(podman) manifest rm $(repo_name)/pcloud-installer:latest