Remove the QEMU build argument and do some cleanup

It appears like the tmpfs hack will work for us in order to be able
to build 32-bit images again, so let's remove some of the debugging
stuff used during initial testing.

Author: JonasAlfredsson

.github/workflows/build_latest.yml

@@ -45,16 +45,9 @@ jobs:
           push: ${{ github.event_name != 'pull_request' }}
           tags: jonasal/nginx-certbot:latest
 
-      - name: Print usage info
-        shell: bash
-        run: |
-          sudo df -h
-          echo
-          sudo free -h
-
   docker_buildx_alpine:
     runs-on: ubuntu-latest
-    timeout-minutes: 180
+    timeout-minutes: 120
     steps:
       - name: Run Docker on tmpfs
         uses: JonasAlfredsson/docker-on-tmpfs@v1.0.0
@@ -79,10 +72,3 @@ jobs:
             linux/arm/v7
           push: ${{ github.event_name != 'pull_request' }}
           tags: jonasal/nginx-certbot:latest-alpine
-
-      - name: Print usage info
-        shell: bash
-        run: |
-          sudo df -h
-          echo
-          sudo free -h

.github/workflows/build_tags.yml

@@ -49,7 +49,7 @@ jobs:
 
   docker_buildx_alpine:
     runs-on: ubuntu-latest
-    timeout-minutes: 180
+    timeout-minutes: 120
     steps:
       - name: Run Docker on tmpfs
         uses: JonasAlfredsson/docker-on-tmpfs@v1.0.0

src/Dockerfile

@@ -1,8 +1,6 @@
 FROM nginx:1.21.3
 LABEL maintainer="Jonas Alfredsson <jonas.alfredsson@protonmail.com>"
 
-ARG BUILDX_QEMU_ENV
-
 ENV CERTBOT_DNS_AUTHENTICATORS \
     cloudflare \
     cloudxns \