parameterize base image and tag to make for easier testing (#24)

* parameterize base image and tag to make for easier testing

I figured this would make for easier testing of new combinations, like
adding Plucky support in order to support things like the Intel N150

* skip docker login for PR

---------

Co-authored-by: Jason Dove <1695733+jasongdove@users.noreply.github.com>

.github/workflows/docker.yml

@@ -44,6 +44,7 @@ jobs:
         with:
           username: ${{ secrets.docker_hub_username }}
           password: ${{ secrets.docker_hub_access_token }}
+        if: ${{ github.ref == 'refs/heads/main' }}
 
       - name: Build and push
         uses: docker/build-push-action@v5

Dockerfile

@@ -1,4 +1,7 @@
-FROM ghcr.io/linuxserver/baseimage-ubuntu:noble AS devel-base
+ARG base_image=ghcr.io/linuxserver/baseimage-ubuntu
+ARG base_image_tag=noble
+
+FROM ${base_image}:${base_image_tag} AS devel-base
 
 ENV DEBIAN_FRONTEND="noninteractive"
 ENV MAKEFLAGS="-j4" \
@@ -116,9 +119,9 @@ RUN apt-get -yqq update && \
     cargo install cargo-c cbindgen --locked && \
     python3 -m venv /lsiopy && \
     pip install -U --no-cache-dir \
-        pip \
-        setuptools \
-        wheel && \
+    pip \
+    setuptools \
+    wheel && \
     pip install --no-cache-dir cmake==3.31.6 mako meson ninja packaging ply pyyaml
 
 # aom