Feature: Docker multiarch image (amd64 & arm64) dynamic tags and ghcr repositoy (#400)

* Enabled multiarch build with buildx, qemu and also enabled ghcr, improved tagging

- Enabled multiarch build with buildx, qemu and also enabled ghcr
- Improved image tagging
- Getting rid unknown/unknonw architecture in ghcr
    - https://github.com/docker/build-push-action
    - https://docs.docker.com/build/attestations/slsa-provenance/
    - https://github.com/docker/build-push-action/issues/820

* Switched to lukechannings/deno docke rimage as proposed in #136

- silverbulletmd/silverbullet/issues/136

(cherry picked from commit 176b70f5481dbbef9744818662f47617903de209)

* Added tini, condensed Dockerfile Run to one step, cleaning up image

- tini is missing in new base image, so I added it manually, as
  documented in https://github.com/krallin/tini

(cherry picked from commit 4d549b8f5b45bcc9ea04a0e7a4fdc3c82cdd7f5c)

* Using TARGETARCH for downloading tini

(cherry picked from commit 23a6019da00115b34c3bd09eb0c733172edcebbc)

Dockerfile

@@ -1,5 +1,4 @@
-FROM denoland/deno:alpine-1.33.2
-
+FROM lukechannings/deno:v1.33.2
 # The volume that will keep the space data
 # Create a volume first:
 #   docker volume create myspace
@@ -7,12 +6,29 @@ FROM denoland/deno:alpine-1.33.2
 #   docker run -v myspace:/space -it zefhemel/silverbullet
 VOLUME /space
 
+# Accept TARGETARCH as argument
+ARG TARGETARCH
+
+# Adding tini manually, as it's not included anymore in the new baseimage
+ENV TINI_VERSION v0.19.0
+ADD https://github.com/krallin/tini/releases/download/${TINI_VERSION}/tini-${TARGETARCH} /tini
+
 # Copy the bundled version of silverbullet into the container
 ADD ./dist/silverbullet.js /silverbullet.js
 
 # Make sure the deno user has access to the space volume
-RUN mkdir -p /space
-RUN chown -R deno:deno /space
+RUN mkdir -p /space \
+ && chown -R deno:deno /space \
+ && chmod +x /tini \
+ && echo "**** cleanup ****" \
+ && apt-get -y autoremove \
+ && apt-get clean  \
+ && rm -rf \
+    /tmp/* \
+    /var/lib/apt/lists/* \
+    /var/tmp/* \
+    /var/log/* \
+    /usr/share/man
 
 # deno user id is 1000 in alpine image
 USER deno
@@ -23,4 +39,4 @@ EXPOSE 3000
 
 # Run the server, allowing to pass in additional argument at run time, e.g.
 #   docker run -p 3002:3000 -v myspace:/space -it zefhemel/silverbullet --user me:letmein
-ENTRYPOINT ["/tini", "--", "deno", "run", "-A", "--unstable", "/silverbullet.js", "--hostname", "0.0.0.0", "/space"]
+ENTRYPOINT ["/tini", "--", "deno", "run", "-A", "--unstable", "/silverbullet.js", "--hostname", "0.0.0.0", "/space"]