Add riscv64 arch (#13458)

<!--Ex. Fixing a bug - Describe the bug and how this fixes the issue.
Ex. Adding a feature - Explain what this achieves.-->
#### Description

New Tier 3 platform: `riscv64` architecture is now included, allowing
the collector to be built and distributed for this platform.

<!-- Issue number if applicable -->
#### Link to tracking issue
Fixes #13462
X-Ref:
open-telemetry/opentelemetry-collector-releases#969

<!--Describe what testing was performed and which tests were added.-->
#### Testing

I’ve performed basic compilation as well as starting collector inside a
linux/riscv64 container (`docker.io/riscv64/debian`).

<!--Describe the documentation added.-->
#### Documentation

Added myself as a contact point to `platform-support.md` document.

---------

Signed-off-by: Mateusz Urbanek <[email protected]>
Co-authored-by: Pablo Baeyens <[email protected]>

Author: shanduur

.chloggen/rv64.yaml

@@ -0,0 +1,25 @@
+# Use this changelog template to create an entry for release notes.
+
+# One of 'breaking', 'deprecation', 'new_component', 'enhancement', 'bug_fix'
+change_type: enhancement
+
+# The name of the component, or a single word describing the area of concern, (e.g. otlpreceiver)
+component: architecture
+
+# A brief description of the change.  Surround your text with quotes ("") if it needs to start with a backtick (`).
+note: New Tier 3 platform riscv64 allowing the collector to be built and distributed for this platform.
+
+# One or more tracking issues or pull requests related to the change
+issues: [ 13462 ]
+
+# (Optional) One or more lines of additional information to render under the primary note.
+# These lines will be padded with 2 spaces and then inserted directly into the document.
+# Use pipe (|) for multiline entries.
+subtext:
+
+# Optional: The change log or logs in which this entry should be included.
+# e.g. '[user]' or '[user, api]'
+# Include 'user' if the change is relevant to end users.
+# Include 'api' if there is a change to a library API.
+# Default: '[user]'
+change_logs: []

.github/workflows/build-and-test.yml

@@ -254,6 +254,8 @@ jobs:
             goarch: arm64
           - goos: linux
             goarch: ppc64le
+          - goos: linux
+            goarch: riscv64
           - goos: linux
             goarch: arm
             goarm: 7

.github/workflows/utils/cspell.json

@@ -396,6 +396,7 @@
       "resourceprocessor",
       "resourcetolabel",
       "retryable",
+      "riscv",
       "rpcz",
       "rrschulze",
       "runperf",
@@ -414,6 +415,7 @@
       "servicetest",
       "servicez",
       "sfixed",
+      "shanduur",
       "sharedcomponent",
       "sigstore",
       "someclientid",

docs/platform-support.md

@@ -64,6 +64,7 @@ Tier 3 platforms are currently:
 | linux/386     | [@andrzej-stencel](https://github.com/andrzej-stencel)                                                                                                         |
 | linux/arm     | [@Wal8800](https://github.com/Wal8800), [@atoulme](https://github.com/atoulme)                                                                                 |
 | linux/ppc64le | [@IBM-Currency-Helper](https://github.com/IBM-Currency-Helper), [@adilhusain-s](https://github.com/adilhusain-s), [@seth-priya](https://github.com/seth-priya) |
+| linux/riscv64 | [@shanduur](https://github.com/shanduur)                                                                                                                       |
 | linux/s390x   | [@bwalk-at-ibm](https://github.com/bwalk-at-ibm), [@rrschulze](https://github.com/rrschulze)                                                                   |
 | windows/386   | [@pjanotti](https://github.com/pjanotti)                                                                                                                       |