Update dnsseeder gcloud deployment workflow (#7)

* Try pinning older version of golang

.github/workflows/gcloud.yml

@@ -1,9 +1,11 @@
 name: gcloud
 
 on:
+  workflow_dispatch:
   push:
     branches:
     - master
+    - update-gcloud
 
 env:
   PROJECT_ID: ecosystem-infrastructure
@@ -21,8 +23,8 @@ jobs:
       run: |
         BRANCH_NAME=$GITHUB_REPOSITORY/$(expr $GITHUB_REF : '.*/\(.*\)') && \
         BRANCH_NAME=${BRANCH_NAME,,} && \
-        echo "::set-env name=BRANCH_NAME::$BRANCH_NAME" && \
-        echo "::set-env name=SHA7::$(git rev-parse --short=7 $GITHUB_SHA)"
+        echo "BRANCH_NAME=$BRANCH_NAME" >> $GITHUB_ENV && \
+        echo "SHORT_SHA=$(git rev-parse --short=7 $GITHUB_SHA)" >> $GITHUB_ENV
 
     # Setup gcloud CLI
     - uses: GoogleCloudPlatform/github-actions/setup-gcloud@master
@@ -36,17 +38,17 @@ jobs:
       # Tagging w/ the commit SHA blocks the :latest tag on GCR
       run: |
         gcloud builds submit \
-          --tag "gcr.io/$PROJECT_ID/$BRANCH_NAME:$SHA7"
+          --tag "gcr.io/$PROJECT_ID/$BRANCH_NAME:$SHORT_SHA"
 
     # Deploy image to Compute Engine
     - name: Deploy
       run: |
-        gcloud compute instances create-with-container "zfnd-seeder-$SHA7" \
+        gcloud compute instances create-with-container "zfnd-seeder-$SHORT_SHA" \
           --zone "$GCLOUD_ZONE" \
           --service-account instance-service-account@ecosystem-infrastructure.iam.gserviceaccount.com \
           --scopes cloud-platform \
           --machine-type n1-highcpu-4 \
-          --container-image "gcr.io/$PROJECT_ID/$BRANCH_NAME:$SHA7" \
+          --container-image "gcr.io/$PROJECT_ID/$BRANCH_NAME:$SHORT_SHA" \
           --tags seeder \
           --metadata-from-file startup-script=scripts/seeder-zfnd-org-startup.sh \
           --container-mount-host-path mount-path=/etc/dnsseeder,host-path=/etc/dnsseeder,mode=ro

Dockerfile

@@ -1,4 +1,4 @@
-FROM golang:alpine as builder
+FROM golang:1.14.4-alpine as builder
 LABEL maintainer "George Tankersley <george@zfnd.org>"
 
 ENV PATH /go/bin:/usr/local/go/bin:$PATH