Improve build scripts (#16)

* Better handle installation requirements

* Install TVHeadend from edge repos

* Refactor Build Script

* Try installing a different git version

* Pin to Specific Versions of musl and gcc

To fix build CI

* Bump base images properly

* Prettified Code!

* Remove git and mono pinned to a specific version

Co-authored-by: GauthamVarmaK <GauthamVarmaK@users.noreply.github.com>

tvheadend/Dockerfile

@@ -2,10 +2,6 @@ ARG BUILD_FROM=ghcr.io/hassio-addons/base/amd64:9.2.2
 # hadolint ignore=DL3006
 FROM ${BUILD_FROM}
 
-RUN echo 'http://dl-cdn.alpinelinux.org/alpine/edge/testing' >> /etc/apk/repositories
-RUN echo 'http://dl-cdn.alpinelinux.org/alpine/edge/community' >> /etc/apk/repositories
-RUN echo 'http://dl-cdn.alpinelinux.org/alpine/edge/main' >> /etc/apk/repositories
-
 COPY run.sh /run.sh
 RUN chmod +x /run.sh
 RUN /run.sh