Update dockerfile, add requirements.txt and change dependabot

Update dockerfile and add requirements.txt:
This allows for easier management and allows for dependabot to auto-open a PR when the pip packages are updated lowering management time.

Have also added the option for chmod of the entry.sh to be done during the copy stage rather than later, allowing this step to be cached when required, lowering build time and layer size.

.github/dependabot.yml

@@ -8,3 +8,15 @@ updates:
     schedule:
       # Check for updates to GitHub Actions every weekday
       interval: "daily"
+
+  # Maintain dependencies for Docker
+  - package-ecosystem: "docker" # See documentation for possible values
+    directory: "/base" # Location of package manifests
+    schedule:
+      interval: "daily"
+
+  # Maintain dependencies for PIP
+  - package-ecosystem: "pip"
+    directory: "/base"
+    schedule:
+      interval: "daily"

base/Dockerfile

@@ -1,8 +1,6 @@
 FROM alpine:3.15 as builder
 LABEL mainainer='b3vis'
-ARG BORG_VERSION=1.2.0
-ARG BORGMATIC_VERSION=1.6.0
-ARG LLFUSE_VERSION=1.4.1
+COPY requirements.txt /requirements.txt
 RUN apk upgrade --no-cache \
     && apk add --no-cache \
     alpine-sdk \
@@ -16,14 +14,11 @@ RUN apk upgrade --no-cache \
     fuse-dev \
     attr-dev \
     py3-wheel \
-    && pip3 install --upgrade pip \
-    && pip3 install --upgrade borgbackup==${BORG_VERSION} \
-    && pip3 install --upgrade borgmatic==${BORGMATIC_VERSION} \
-    && pip3 install --upgrade llfuse==${LLFUSE_VERSION}
+    && pip3 install --no-cache-dir -U -r requirements.txt
 
 FROM alpine:3.15
 LABEL mainainer='b3vis'
-COPY entry.sh /entry.sh
+COPY --chmod=755 entry.sh /entry.sh
 RUN apk upgrade --no-cache \
     && apk add --no-cache \
     tzdata \
@@ -40,8 +35,7 @@ RUN apk upgrade --no-cache \
     curl \
     findmnt \
     logrotate \
-    && rm -rf /var/cache/apk/* \
-    && chmod 755 /entry.sh
+    && rm -rf /var/cache/apk/*
 VOLUME /mnt/source
 VOLUME /mnt/borg-repository
 VOLUME /etc/borgmatic.d

base/requirements.txt

@@ -0,0 +1,4 @@
+pip==22.1.1
+llfuse==1.4.1
+borgbackup==1.2.0
+borgmatic==1.6.0