Refresh dependencies and simplify now that all deps work on Pi 4

Dockerfile

-FROM arm32v7/node:10-buster-slim
-
-# Install some extra packages to make sure we can build and "npm install" our dependencies later
-# All is done in a single step to avoid unnecessarily building intermediate images
-RUN apt-get update && apt-get install --no-install-recommends -y curl git gcc g++ make python2
-RUN mkdir -p /usr/src && \
- curl -s http://www.airspayce.com/mikem/bcm2835/bcm2835-1.60.tar.gz | tar -C /usr/src -xvz && \
- (cd /usr/src/bcm2835-1.60 && \
-  ./configure --prefix=/usr && \
-  make && \
-  make install) && \
- git clone --branch V71 https://github.com/joan2937/pigpio.git /usr/src/pigpio && \
+FROM arm32v7/node:12-alpine
+
+# Install the BCM2835 library - required by the node-dht-sensor node.js package
+# This is disabled now as the library is bundled with node-dht-sensor >= 0.4
+#
+# RUN apk add --no-cache curl gcc g++ make && \
+#  mkdir -p /usr/src && \
+#  curl -s http://www.airspayce.com/mikem/bcm2835/bcm2835-1.60.tar.gz | tar -C /usr/src -xvz && \
+#  (cd /usr/src/bcm2835-1.60 && \
+#   ./configure --prefix=/usr && \
+#   make && \
+#   make install) && \
+#  rm -rf /usr/src/bcm2835-1.60
+
+# Install the pigpio C library - required by the pigpio node.js package
+RUN apk add --no-cache git gcc g++ make python2 && \
+ git clone -b V71 --single-branch https://github.com/joan2937/pigpio.git /usr/src/pigpio && \
  (cd /usr/src/pigpio && \
   sed -i 's,/usr/local,/usr,' Makefile && \
+  sed -i 's,ldconfig,,' Makefile && \
   make && \
   make install) && \
- rm -rf /usr/src/{bcm2835-1.60,pigpio}
+ rm -rf /usr/src/pigpio
 
 # Create app directory
 WORKDIR /usr/src/app

package.json

@@ -13,8 +13,8 @@
     "express": "^4.17.1"
   },
   "optionalDependencies": {
-    "node-dht-sensor": "^0.0.36",
-    "onoff": "^4.1.3",
-    "pigpio": "^1.2.3"
+    "node-dht-sensor": "^0.4.0",
+    "onoff": "^5.0.0",
+    "pigpio": "^2.0.1"
   }
 }