docker-compose.yml: specify AMD64 platform

Several Docker images used by Segment do not work reliably on Mac M1 laptops,
which use the ARM chipset. Commonly, these are images that were built several
years ago, before M1 laptops were in widespread use, and behave unpredictably
when run on an ARM chipset.

The simplest workaround is to ensure that the Docker environment is always
running on x86. This change should ensure that employees with M1 laptops will be
able to reliably start and run Docker containers on this repository.

docker-compose.yml

@@ -7,35 +7,50 @@ services:
     image: hashicorp/consul:latest
     command: agent -server -dev -log-level debug -client 0.0.0.0
     ports:
-      - 8500:8500
+    - 8500:8500
 
+    # If you are on arm64 and experiencing issues with the tests (hangs,
+    # connection reset) then try the following in order:
+
+    # - stopping and removing all downloaded container images
+    # - ensuring you have the latest Docker Desktop version
+    # - factory reset your Docker Desktop settings
+
+    # If you are still running into issues please post in #help-infra-seg.
+    platform: linux/amd64
   nsqlookupd-1:
     image: nsqio/nsq:v0.3.8
     command: >
       /nsqlookupd
       -broadcast-address localhost:4160
     ports:
-      - 4160:4160
-      - 4161:4161
+    - 4160:4160
+    - 4161:4161
 
+    # See platform comment above for amd64/arm64 troubleshooting
+    platform: linux/amd64
   nsqlookupd-2:
     image: nsqio/nsq:v0.3.8
     command: >
       /nsqlookupd
       -broadcast-address localhost:4162
     ports:
-      - 4162:4160
-      - 4163:4161
+    - 4162:4160
+    - 4163:4161
 
+    # See platform comment above for amd64/arm64 troubleshooting
+    platform: linux/amd64
   nsqlookupd-3:
     image: nsqio/nsq:v0.3.8
     command: >
       /nsqlookupd
       -broadcast-address localhost:4164
     ports:
-      - 4164:4160
-      - 4165:4161
+    - 4164:4160
+    - 4165:4161
 
+    # See platform comment above for amd64/arm64 troubleshooting
+    platform: linux/amd64
   nsqd-1:
     image: nsqio/nsq:v0.3.8
     command: >
@@ -45,13 +60,15 @@ services:
       -lookupd-tcp-address nsqlookupd-2:4160
       -lookupd-tcp-address nsqlookupd-3:4160
     ports:
-      - 4150:4150
-      - 4151:4151
+    - 4150:4150
+    - 4151:4151
     depends_on:
-      - nsqlookupd-1
-      - nsqlookupd-2
-      - nsqlookupd-3
+    - nsqlookupd-1
+    - nsqlookupd-2
+    - nsqlookupd-3
 
+    # See platform comment above for amd64/arm64 troubleshooting
+    platform: linux/amd64
   nsqd-2:
     image: nsqio/nsq:v0.3.8
     command: >
@@ -61,13 +78,15 @@ services:
       -lookupd-tcp-address nsqlookupd-2:4160
       -lookupd-tcp-address nsqlookupd-3:4160
     ports:
-      - 4152:4150
-      - 4153:4151
+    - 4152:4150
+    - 4153:4151
     depends_on:
-      - nsqlookupd-1
-      - nsqlookupd-2
-      - nsqlookupd-3
+    - nsqlookupd-1
+    - nsqlookupd-2
+    - nsqlookupd-3
 
+    # See platform comment above for amd64/arm64 troubleshooting
+    platform: linux/amd64
   nsqd-3:
     image: nsqio/nsq:v0.3.8
     command: >
@@ -77,9 +96,11 @@ services:
       -lookupd-tcp-address nsqlookupd-2:4160
       -lookupd-tcp-address nsqlookupd-3:4160
     ports:
-      - 4154:4150
-      - 4155:4151
+    - 4154:4150
+    - 4155:4151
     depends_on:
-      - nsqlookupd-1
-      - nsqlookupd-2
-      - nsqlookupd-3
+    - nsqlookupd-1
+    - nsqlookupd-2
+    - nsqlookupd-3
+    # See platform comment above for amd64/arm64 troubleshooting
+    platform: linux/amd64