Various updates for renaming the master branch to main

.github/PULL_REQUEST_TEMPLATE.md

@@ -2,6 +2,6 @@
 
 <!-- Please read docs/CONTRIBUTING.md before submitting your pull request -->
 
-* [ ] Pull request includes a [sign off](https://github.com/matrix-org/dendrite/blob/master/docs/CONTRIBUTING.md#sign-off)
+* [ ] Pull request includes a [sign off](https://github.com/matrix-org/dendrite/blob/main/docs/CONTRIBUTING.md#sign-off)
 
 Signed-off-by: `Your Name <your@email.example.org>`

.github/workflows/codeql-analysis.yml

@@ -2,9 +2,9 @@ name: "CodeQL"
 
 on:
   push:
-    branches: [master]
+    branches: [main]
   pull_request:
-    branches: [master]
+    branches: [main]
 
 jobs:
   analyze:
@@ -14,7 +14,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        language: ['go']
+        language: ["go"]
 
     steps:
       - name: Checkout repository

.github/workflows/tests.yml

@@ -2,7 +2,7 @@ name: Tests
 
 on:
   push:
-    branches: [ 'master' ]
+    branches: ["main"]
   pull_request:
 
 concurrency:
@@ -33,7 +33,7 @@ jobs:
           path: dendrite
 
       # Attempt to check out the same branch of Complement as the PR. If it
-      # doesn't exist, fallback to master.
+      # doesn't exist, fallback to main.
       - name: Checkout complement
         shell: bash
         run: |

build.sh

@@ -7,7 +7,7 @@ if [ -d ".git" ]
 then
     export BUILD=`git rev-parse --short HEAD || ""`
     export BRANCH=`(git symbolic-ref --short HEAD | tr -d \/ ) || ""`
-    if [ "$BRANCH" = master ]
+    if [ "$BRANCH" = main ]
     then
         export BRANCH=""
     fi

docs/CONTRIBUTING.md

@@ -37,7 +37,7 @@ If a job fails, click the "details" button and you should be taken to the job's
 logs.
 
 ![Click the details button on the failing build
-step](https://raw.githubusercontent.com/matrix-org/dendrite/master/docs/images/details-button-location.jpg)
+step](https://raw.githubusercontent.com/matrix-org/dendrite/main/docs/images/details-button-location.jpg)
 
 Scroll down to the failing step and you should see some log output. Scan the
 logs until you find what it's complaining about, fix it, submit a new commit,
@@ -57,7 +57,7 @@ significant amount of CPU and RAM.
 
 Once the code builds, run [Sytest](https://github.com/matrix-org/sytest)
 according to the guide in
-[docs/sytest.md](https://github.com/matrix-org/dendrite/blob/master/docs/sytest.md#using-a-sytest-docker-image)
+[docs/sytest.md](https://github.com/matrix-org/dendrite/blob/main/docs/sytest.md#using-a-sytest-docker-image)
 so you can see whether something is being broken and whether there are newly
 passing tests.
 
@@ -94,4 +94,4 @@ For more general questions please use
 
 We ask that everyone who contributes to the project signs off their
 contributions, in accordance with the
-[DCO](https://github.com/matrix-org/matrix-doc/blob/master/CONTRIBUTING.rst#sign-off).
+[DCO](https://github.com/matrix-org/matrix-doc/blob/main/CONTRIBUTING.rst#sign-off).

docs/p2p.md

@@ -6,7 +6,7 @@ These are the instructions for setting up P2P Dendrite, current as of May 2020.
 
 #### Build
 
-- The `master` branch has a WASM-only binary for dendrite: `./cmd/dendritejs`.
+- The `main` branch has a WASM-only binary for dendrite: `./cmd/dendritejs`.
 - Build it and copy assets to riot-web.
 ```
 $ ./build-dendritejs.sh